25172355812 has 24 divisors (see below), whose sum is σ = 44490927936. Its totient is φ = 12460726368.

The previous prime is 25172355797. The next prime is 25172355823. The reversal of 25172355812 is 21855327152.

It is a self number, because there is not a number n which added to its sum of digits gives 25172355812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2620883 + ... + 2630469.

It is an arithmetic number, because the mean of its divisors is an integer number (1853788664).

Almost surely, 2^25172355812 is an apocalyptic number.

It is an amenable number.

25172355812 is a deficient number, since it is larger than the sum of its proper divisors (19318572124).

25172355812 is a wasteful number, since it uses less digits than its factorization.

25172355812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16067 (or 16065 counting only the distinct ones).

The product of its digits is 168000, while the sum is 41.

The spelling of 25172355812 in words is "twenty-five billion, one hundred seventy-two million, three hundred fifty-five thousand, eight hundred twelve".