18572039657 has 24 divisors (see below), whose sum is σ = 20680531872. Its totient is φ = 16656192000.

The previous prime is 18572039639. The next prime is 18572039671. The reversal of 18572039657 is 75693027581.

It is not a de Polignac number, because 18572039657 - 2⁸ = 18572039401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18572039599 and 18572039608.

It is not an unprimeable number, because it can be changed into a prime (18572039677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 491282 + ... + 527732.

It is an arithmetic number, because the mean of its divisors is an integer number (861688828).

Almost surely, 2^18572039657 is an apocalyptic number.

18572039657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18572039657 is a deficient number, since it is larger than the sum of its proper divisors (2108492215).

18572039657 is a wasteful number, since it uses less digits than its factorization.

18572039657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36569 (or 36552 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 53.

The spelling of 18572039657 in words is "eighteen billion, five hundred seventy-two million, thirty-nine thousand, six hundred fifty-seven".