25165406656 has 56 divisors (see below), whose sum is σ = 54079719120. Its totient is φ = 11549847552.

The previous prime is 25165406633. The next prime is 25165406659. The reversal of 25165406656 is 65660456152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25165406659) by changing a digit.

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, 64440 + ... + 233416.

It is an arithmetic number, because the mean of its divisors is an integer number (965709270).

Almost surely, 2^25165406656 is an apocalyptic number.

25165406656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25165406656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27039859560).

25165406656 is an abundant number, since it is smaller than the sum of its proper divisors (28914312464).

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

25165406656 is a wasteful number, since it uses less digits than its factorization.

25165406656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169181 (or 169171 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 25165406656 in words is "twenty-five billion, one hundred sixty-five million, four hundred six thousand, six hundred fifty-six".