25140432520 has 32 divisors (see below), whose sum is σ = 64646827200. Its totient is φ = 8619576768.

The previous prime is 25140432511. The next prime is 25140432557. The reversal of 25140432520 is 2523404152.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44893350 + ... + 44893909.

It is an arithmetic number, because the mean of its divisors is an integer number (2020213350).

Almost surely, 2^25140432520 is an apocalyptic number.

25140432520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25140432520 is an abundant number, since it is smaller than the sum of its proper divisors (39506394680).

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

25140432520 is a wasteful number, since it uses less digits than its factorization.

25140432520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89787277 (or 89787273 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 25140432520 its reverse (2523404152), we get a palindrome (27663836672).

The spelling of 25140432520 in words is "twenty-five billion, one hundred forty million, four hundred thirty-two thousand, five hundred twenty".