18077972695 has 4 divisors (see below), whose sum is σ = 21693567240. Its totient is φ = 14462378152.

The previous prime is 18077972687. The next prime is 18077972713. The reversal of 18077972695 is 59627977081.

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

It is a cyclic number.

It is not a de Polignac number, because 18077972695 - 2³ = 18077972687 is a prime.

It is a super-2 number, since 2×18077972695² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1807797265 + ... + 1807797274.

It is an arithmetic number, because the mean of its divisors is an integer number (5423391810).

Almost surely, 2^18077972695 is an apocalyptic number.

18077972695 is a deficient number, since it is larger than the sum of its proper divisors (3615594545).

18077972695 is an equidigital number, since it uses as much as digits as its factorization.

18077972695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3615594544.

The product of its (nonzero) digits is 13335840, while the sum is 61.

The spelling of 18077972695 in words is "eighteen billion, seventy-seven million, nine hundred seventy-two thousand, six hundred ninety-five".