25251265665520 has 120 divisors (see below), whose sum is σ = 62597679206400. Its totient is φ = 9471016882176.

The previous prime is 25251265665499. The next prime is 25251265665569. The reversal of 25251265665520 is 2556656215252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4189201 + ... + 8249359.

It is an arithmetic number, because the mean of its divisors is an integer number (521647326720).

Almost surely, 2^{25251265665520} is an apocalyptic number.

25251265665520 is a gapful number since it is divisible by the number (20) 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 25251265665520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31298839603200).

25251265665520 is an abundant number, since it is smaller than the sum of its proper divisors (37346413540880).

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

25251265665520 is a wasteful number, since it uses less digits than its factorization.

25251265665520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060475 (or 4060452 counting only the distinct ones).

The product of its (nonzero) digits is 10800000, while the sum is 52.

The spelling of 25251265665520 in words is "twenty-five trillion, two hundred fifty-one billion, two hundred sixty-five million, six hundred sixty-five thousand, five hundred twenty".