18407072357 has 4 divisors (see below), whose sum is σ = 19041799020. Its totient is φ = 17772345696.

The previous prime is 18407072351. The next prime is 18407072381. The reversal of 18407072357 is 75327070481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9308583361 + 9098488996 = 96481^2 + 95386^2 .

It is a cyclic number.

It is not a de Polignac number, because 18407072357 - 2²⁰ = 18406023781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18407072351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317363288 + ... + 317363345.

It is an arithmetic number, because the mean of its divisors is an integer number (4760449755).

Almost surely, 2^18407072357 is an apocalyptic number.

It is an amenable number.

18407072357 is a deficient number, since it is larger than the sum of its proper divisors (634726663).

18407072357 is an equidigital number, since it uses as much as digits as its factorization.

18407072357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634726662.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 18407072357 in words is "eighteen billion, four hundred seven million, seventy-two thousand, three hundred fifty-seven".