25566394104 has 48 divisors (see below), whose sum is σ = 70715567520. Its totient is φ = 8340808320.

The previous prime is 25566394103. The next prime is 25566394109. The reversal of 25566394104 is 40149366552.

25566394104 is a `hidden beast` number, since 2 + 5 + 5 + 6 + 639 + 4 + 1 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 25566394104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25566394103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3774157 + ... + 3780924.

It is an arithmetic number, because the mean of its divisors is an integer number (1473240990).

Almost surely, 2^25566394104 is an apocalyptic number.

25566394104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25566394104 is an abundant number, since it is smaller than the sum of its proper divisors (45149173416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25566394104 is a wasteful number, since it uses less digits than its factorization.

25566394104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7555140 (or 7555133 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 25566394104 in words is "twenty-five billion, five hundred sixty-six million, three hundred ninety-four thousand, one hundred four".