25140452520 has 64 divisors (see below), whose sum is σ = 75601512000. Its totient is φ = 6688107008.

The previous prime is 25140452507. The next prime is 25140452539. The reversal of 25140452520 is 2525404152.

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

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, 199725 + ... + 300284.

It is an arithmetic number, because the mean of its divisors is an integer number (1181273625).

Almost surely, 2^25140452520 is an apocalyptic number.

25140452520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25140452520 is an abundant number, since it is smaller than the sum of its proper divisors (50461059480).

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

25140452520 is a wasteful number, since it uses less digits than its factorization.

25140452520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500442 (or 500438 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 25140452520 its reverse (2525404152), we get a palindrome (27665856672).

The spelling of 25140452520 in words is "twenty-five billion, one hundred forty million, four hundred fifty-two thousand, five hundred twenty".