25640510503920 has 320 divisors, whose sum is σ = 90723247340544. Its totient is φ = 5934470676480.

The previous prime is 25640510503879. The next prime is 25640510503921. The reversal of 25640510503920 is 2930501504652.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640510503921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 54449799 + ... + 54918681.

Almost surely, 2^{25640510503920} is an apocalyptic number.

25640510503920 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 25640510503920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45361623670272).

25640510503920 is an abundant number, since it is smaller than the sum of its proper divisors (65082736836624).

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

25640510503920 is a wasteful number, since it uses less digits than its factorization.

25640510503920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469960 (or 469954 counting only the distinct ones).

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

The spelling of 25640510503920 in words is "twenty-five trillion, six hundred forty billion, five hundred ten million, five hundred three thousand, nine hundred twenty".