25531849920 has 112 divisors (see below), whose sum is σ = 82205584128. Its totient is φ = 6712581120.

The previous prime is 25531849909. The next prime is 25531849939. The reversal of 25531849920 is 2994813552.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 25531849920.

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, 119134 + ... + 255453.

Almost surely, 2^25531849920 is an apocalyptic number.

25531849920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25531849920 is an abundant number, since it is smaller than the sum of its proper divisors (56673734208).

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

25531849920 is a wasteful number, since it uses less digits than its factorization.

25531849920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374678 (or 374668 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 25531849920 in words is "twenty-five billion, five hundred thirty-one million, eight hundred forty-nine thousand, nine hundred twenty".