1870638850369 has 3 divisors (see below), whose sum is σ = 1870640218083. Its totient is φ = 1870637482656.

The previous prime is 1870638850343. The next prime is 1870638850391. The reversal of 1870638850369 is 9630588360781.

The square root of 1870638850369 is 1367713.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 441447292225 + 1429191558144 = 664415^2 + 1195488^2 .

It is not a de Polignac number, because 1870638850369 - 2⁵ = 1870638850337 is a prime.

It is a super-2 number, since 2×1870638850369² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1870638850369.

It is not an unprimeable number, because it can be changed into a prime (1870638850309) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 683857 + ... + 2051569.

It is an arithmetic number, because the mean of its divisors is an integer number (623546739361).

Almost surely, 2^{1870638850369} is an apocalyptic number.

1870638850369 is the 1367713-rd square number.

1870638850369 is the 683857-th centered octagonal number.

It is an amenable number.

1870638850369 is a deficient number, since it is larger than the sum of its proper divisors (1367714).

1870638850369 is an frugal number, since it uses more digits than its factorization.

1870638850369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735426 (or 1367713 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 64.

Multiplying 1870638850369 by its sum of digits (64), we get a square (119720886423616 = 10941704²).

The spelling of 1870638850369 in words is "one trillion, eight hundred seventy billion, six hundred thirty-eight million, eight hundred fifty thousand, three hundred sixty-nine".