25135313520 has 80 divisors (see below), whose sum is σ = 79196886432. Its totient is φ = 6592865280.

The previous prime is 25135313513. The next prime is 25135313531. The reversal of 25135313520 is 2531353152.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 843807 + ... + 873086.

Almost surely, 2^25135313520 is an apocalyptic number.

25135313520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25135313520 is an abundant number, since it is smaller than the sum of its proper divisors (54061572912).

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

25135313520 is a wasteful number, since it uses less digits than its factorization.

25135313520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1716970 (or 1716964 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 30.

Adding to 25135313520 its reverse (2531353152), we get a palindrome (27666666672).

The spelling of 25135313520 in words is "twenty-five billion, one hundred thirty-five million, three hundred thirteen thousand, five hundred twenty".