25566731136 has 160 divisors (see below), whose sum is σ = 76224685680. Its totient is φ = 8506736640.

The previous prime is 25566731123. The next prime is 25566731159. The reversal of 25566731136 is 63113766552.

25566731136 is a `hidden beast` number, since 2 + 5 + 566 + 73 + 1 + 13 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 25566731091 and 25566731100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6643965 + ... + 6647811.

Almost surely, 2^25566731136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25566731136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38112342840).

25566731136 is an abundant number, since it is smaller than the sum of its proper divisors (50657954544).

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

25566731136 is an equidigital number, since it uses as much as digits as its factorization.

25566731136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4514 (or 4493 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The spelling of 25566731136 in words is "twenty-five billion, five hundred sixty-six million, seven hundred thirty-one thousand, one hundred thirty-six".