25231648557 has 32 divisors (see below), whose sum is σ = 38705541120. Its totient is φ = 14514543360.

The previous prime is 25231648553. The next prime is 25231648601. The reversal of 25231648557 is 75584613252.

It is not a de Polignac number, because 25231648557 - 2² = 25231648553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25231648553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389943 + ... + 450020.

It is an arithmetic number, because the mean of its divisors is an integer number (1209548160).

Almost surely, 2^25231648557 is an apocalyptic number.

It is an amenable number.

25231648557 is a deficient number, since it is larger than the sum of its proper divisors (13473892563).

25231648557 is a wasteful number, since it uses less digits than its factorization.

25231648557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840033.

The product of its digits is 2016000, while the sum is 48.

The spelling of 25231648557 in words is "twenty-five billion, two hundred thirty-one million, six hundred forty-eight thousand, five hundred fifty-seven".