18056562539 has 4 divisors (see below), whose sum is σ = 18088980624. Its totient is φ = 18024144456.

The previous prime is 18056562509. The next prime is 18056562553. The reversal of 18056562539 is 93526565081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93526565081 = 13451 ⋅6953131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18056562539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18056562509) 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, 16208207 + ... + 16209320.

It is an arithmetic number, because the mean of its divisors is an integer number (4522245156).

Almost surely, 2^18056562539 is an apocalyptic number.

18056562539 is a deficient number, since it is larger than the sum of its proper divisors (32418085).

18056562539 is an equidigital number, since it uses as much as digits as its factorization.

18056562539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32418084.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The spelling of 18056562539 in words is "eighteen billion, fifty-six million, five hundred sixty-two thousand, five hundred thirty-nine".