25165516236 has 96 divisors (see below), whose sum is σ = 68779200000. Its totient is φ = 7158481344.

The previous prime is 25165516231. The next prime is 25165516237. The reversal of 25165516236 is 63261556152.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (25165516231) 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, 929215 + ... + 955913.

It is an arithmetic number, because the mean of its divisors is an integer number (716450000).

Almost surely, 2^25165516236 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 25165516236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34389600000).

25165516236 is an abundant number, since it is smaller than the sum of its proper divisors (43613683764).

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

25165516236 is a wasteful number, since it uses less digits than its factorization.

25165516236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26956 (or 26940 counting only the distinct ones).

The product of its digits is 324000, while the sum is 42.

The spelling of 25165516236 in words is "twenty-five billion, one hundred sixty-five million, five hundred sixteen thousand, two hundred thirty-six".