18915105057 has 4 divisors (see below), whose sum is σ = 25220140080. Its totient is φ = 12610070036.

The previous prime is 18915105047. The next prime is 18915105073. The reversal of 18915105057 is 75050151981.

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.

It is a cyclic number.

It is not a de Polignac number, because 18915105057 - 2⁶ = 18915104993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18915105047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3152517507 + ... + 3152517512.

It is an arithmetic number, because the mean of its divisors is an integer number (6305035020).

Almost surely, 2^18915105057 is an apocalyptic number.

It is an amenable number.

18915105057 is a deficient number, since it is larger than the sum of its proper divisors (6305035023).

18915105057 is an equidigital number, since it uses as much as digits as its factorization.

18915105057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6305035022.

The product of its (nonzero) digits is 63000, while the sum is 42.

The spelling of 18915105057 in words is "eighteen billion, nine hundred fifteen million, one hundred five thousand, fifty-seven".