18077731684 has 6 divisors (see below), whose sum is σ = 31636030454. Its totient is φ = 9038865840.

The previous prime is 18077731667. The next prime is 18077731723. The reversal of 18077731684 is 48613777081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10098240100 + 7979491584 = 100490^2 + 89328^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2259716457 + ... + 2259716464.

Almost surely, 2^18077731684 is an apocalyptic number.

It is an amenable number.

18077731684 is a deficient number, since it is larger than the sum of its proper divisors (13558298770).

18077731684 is a wasteful number, since it uses less digits than its factorization.

18077731684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519432925 (or 4519432923 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 52.

The spelling of 18077731684 in words is "eighteen billion, seventy-seven million, seven hundred thirty-one thousand, six hundred eighty-four".