25165531000 has 32 divisors (see below), whose sum is σ = 58887344880. Its totient is φ = 10066212000.

The previous prime is 25165530991. The next prime is 25165531007. The reversal of 25165531000 is 13556152.

It is a super-2 number, since 2×25165531000² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25165531000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25165531007) 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 7 ways as a sum of consecutive naturals, for example, 12581766 + ... + 12583765.

Almost surely, 2^25165531000 is an apocalyptic number.

25165531000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25165531000 is an abundant number, since it is smaller than the sum of its proper divisors (33721813880).

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

25165531000 is a wasteful number, since it uses less digits than its factorization.

25165531000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25165552 (or 25165538 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 25165531000 in words is "twenty-five billion, one hundred sixty-five million, five hundred thirty-one thousand".