25663399204 has 27 divisors (see below), whose sum is σ = 45269824593. Its totient is φ = 12729973872.

The previous prime is 25663399163. The next prime is 25663399207. The reversal of 25663399204 is 40299336652.

It is a happy number.

The square root of 25663399204 is 160198.

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., 23344784100 + 2318615104 = 152790^2 + 48152^2 .

It is a super-2 number, since 2×25663399204² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25663399207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 55428277 + ... + 55428739.

Almost surely, 2^25663399204 is an apocalyptic number.

25663399204 is the 160198-th square number.

It is an amenable number.

25663399204 is a deficient number, since it is larger than the sum of its proper divisors (19606425389).

25663399204 is an frugal number, since it uses more digits than its factorization.

25663399204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 49.

Multiplying 25663399204 by its sum of digits (49), we get a square (1257506560996 = 1121386²).

The spelling of 25663399204 in words is "twenty-five billion, six hundred sixty-three million, three hundred ninety-nine thousand, two hundred four".