18677270957 has 4 divisors (see below), whose sum is σ = 19489326240. Its totient is φ = 17865215676.

The previous prime is 18677270947. The next prime is 18677270981. The reversal of 18677270957 is 75907277681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75907277681 = 67 ⋅1132944443.

It is a cyclic number.

It is not a de Polignac number, because 18677270957 - 2⁶ = 18677270893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18677270896 and 18677270905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18677270947) 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, 406027607 + ... + 406027652.

It is an arithmetic number, because the mean of its divisors is an integer number (4872331560).

Almost surely, 2^18677270957 is an apocalyptic number.

It is an amenable number.

18677270957 is a deficient number, since it is larger than the sum of its proper divisors (812055283).

18677270957 is an equidigital number, since it uses as much as digits as its factorization.

18677270957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812055282.

The product of its (nonzero) digits is 10372320, while the sum is 59.

The spelling of 18677270957 in words is "eighteen billion, six hundred seventy-seven million, two hundred seventy thousand, nine hundred fifty-seven".