25391575940 has 24 divisors (see below), whose sum is σ = 53326152600. Its totient is φ = 10155898368.

The previous prime is 25391575877. The next prime is 25391575973. The reversal of 25391575940 is 4957519352.

It can be written as a sum of positive squares in 4 ways, for example, as 6801664 + 25384774276 = 2608^2 + 159326^2 .

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, 303836 + ... + 378284.

It is an arithmetic number, because the mean of its divisors is an integer number (2221923025).

Almost surely, 2^25391575940 is an apocalyptic number.

25391575940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25391575940 is an abundant number, since it is smaller than the sum of its proper divisors (27934576660).

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

25391575940 is a wasteful number, since it uses less digits than its factorization.

25391575940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91511 (or 91509 counting only the distinct ones).

The product of its (nonzero) digits is 1701000, while the sum is 50.

The spelling of 25391575940 in words is "twenty-five billion, three hundred ninety-one million, five hundred seventy-five thousand, nine hundred forty".