1855692368644 has 27 divisors (see below), whose sum is σ = 3256061669301. Its totient is φ = 925395518160.

The previous prime is 1855692368641. The next prime is 1855692368653. The reversal of 1855692368644 is 4468632965581.

The square root of 1855692368644 is 1362238.

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

It can be written as a sum of positive squares in only one way, i.e., 737259215044 + 1118433153600 = 858638^2 + 1057560^2 .

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 1855692368644.

It is not an unprimeable number, because it can be changed into a prime (1855692368641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1473940887 + ... + 1473942145.

Almost surely, 2^{1855692368644} is an apocalyptic number.

1855692368644 is the 1362238-th square number.

It is an amenable number.

1855692368644 is a deficient number, since it is larger than the sum of its proper divisors (1400369300657).

1855692368644 is an frugal number, since it uses more digits than its factorization.

1855692368644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604 (or 1802 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 67.

The spelling of 1855692368644 in words is "one trillion, eight hundred fifty-five billion, six hundred ninety-two million, three hundred sixty-eight thousand, six hundred forty-four".