18707021425 has 96 divisors (see below), whose sum is σ = 26664007680. Its totient is φ = 12933043200.

The previous prime is 18707021419. The next prime is 18707021447. The reversal of 18707021425 is 52412070781.

It is not a de Polignac number, because 18707021425 - 2⁷ = 18707021297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 38412532 + ... + 38413018.

It is an arithmetic number, because the mean of its divisors is an integer number (277750080).

Almost surely, 2^18707021425 is an apocalyptic number.

It is an amenable number.

18707021425 is a deficient number, since it is larger than the sum of its proper divisors (7956986255).

18707021425 is a wasteful number, since it uses less digits than its factorization.

18707021425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The spelling of 18707021425 in words is "eighteen billion, seven hundred seven million, twenty-one thousand, four hundred twenty-five".