25656530064 has 80 divisors (see below), whose sum is σ = 72333019200. Its totient is φ = 7771668480.

The previous prime is 25656530059. The next prime is 25656530083. The reversal of 25656530064 is 46003565652.

It is a junction number, because it is equal to n+sod(n) for n = 25656529998 and 25656530025.

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 15 ways as a sum of consecutive naturals, for example, 1601904 + ... + 1617840.

It is an arithmetic number, because the mean of its divisors is an integer number (904162740).

Almost surely, 2^25656530064 is an apocalyptic number.

25656530064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25656530064 is an abundant number, since it is smaller than the sum of its proper divisors (46676489136).

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

25656530064 is a wasteful number, since it uses less digits than its factorization.

25656530064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19008 (or 19002 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 25656530064 in words is "twenty-five billion, six hundred fifty-six million, five hundred thirty thousand, sixty-four".