1868735478289 has 3 divisors (see below), whose sum is σ = 1868736845307. Its totient is φ = 1868734111272.

The previous prime is 1868735478221. The next prime is 1868735478299. The reversal of 1868735478289 is 9828745378681.

The square root of 1868735478289 is 1367017.

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., 1507063140625 + 361672337664 = 1227625^2 + 601392^2 .

It is not a de Polignac number, because 1868735478289 - 2¹¹ = 1868735476241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1868735478299) 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, 683509 + ... + 2050525.

It is an arithmetic number, because the mean of its divisors is an integer number (622912281769).

Almost surely, 2^{1868735478289} is an apocalyptic number.

1868735478289 is the 1367017-th square number.

1868735478289 is the 683509-th centered octagonal number.

It is an amenable number.

1868735478289 is a deficient number, since it is larger than the sum of its proper divisors (1367018).

1868735478289 is an frugal number, since it uses more digits than its factorization.

1868735478289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2734034 (or 1367017 counting only the distinct ones).

The product of its digits is 1300561920, while the sum is 76.

It can be divided in two parts, 1868735 and 478289, that added together give a square (2347024 = 1532²).

The spelling of 1868735478289 in words is "one trillion, eight hundred sixty-eight billion, seven hundred thirty-five million, four hundred seventy-eight thousand, two hundred eighty-nine".