18077731678 has 16 divisors (see below), whose sum is σ = 28547021520. Its totient is φ = 8562165696.

The previous prime is 18077731667. The next prime is 18077731723. The reversal of 18077731678 is 87613777081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401050 + ... + 443842.

It is an arithmetic number, because the mean of its divisors is an integer number (1784188845).

Almost surely, 2^18077731678 is an apocalyptic number.

18077731678 is a deficient number, since it is larger than the sum of its proper divisors (10469289842).

18077731678 is a wasteful number, since it uses less digits than its factorization.

18077731678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53931.

The product of its (nonzero) digits is 2765952, while the sum is 55.

The spelling of 18077731678 in words is "eighteen billion, seventy-seven million, seven hundred thirty-one thousand, six hundred seventy-eight".