25320321656 has 32 divisors (see below), whose sum is σ = 55412259840. Its totient is φ = 10620680928.

The previous prime is 25320321643. The next prime is 25320321751. The reversal of 25320321656 is 65612302352.

It is a super-2 number, since 2×25320321656² (a number of 22 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 4807460 + ... + 4812723.

It is an arithmetic number, because the mean of its divisors is an integer number (1731633120).

Almost surely, 2^25320321656 is an apocalyptic number.

It is an amenable number.

25320321656 is an abundant number, since it is smaller than the sum of its proper divisors (30091938184).

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

25320321656 is a wasteful number, since it uses less digits than its factorization.

25320321656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9620243 (or 9620239 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 25320321656 in words is "twenty-five billion, three hundred twenty million, three hundred twenty-one thousand, six hundred fifty-six".