18871972525 has 48 divisors (see below), whose sum is σ = 27101122560. Its totient is φ = 12769099200.

The previous prime is 18871972501. The next prime is 18871972531. The reversal of 18871972525 is 52527917881.

It is a happy number.

It is not a de Polignac number, because 18871972525 - 2²⁷ = 18737754797 is a prime.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 5072616 + ... + 5076334.

It is an arithmetic number, because the mean of its divisors is an integer number (564606720).

Almost surely, 2^18871972525 is an apocalyptic number.

It is an amenable number.

18871972525 is a deficient number, since it is larger than the sum of its proper divisors (8229150035).

18871972525 is a wasteful number, since it uses less digits than its factorization.

18871972525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4114 (or 4109 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 55.

The spelling of 18871972525 in words is "eighteen billion, eight hundred seventy-one million, nine hundred seventy-two thousand, five hundred twenty-five".