18077731802 has 16 divisors (see below), whose sum is σ = 29991747912. Its totient is φ = 8118066240.

The previous prime is 18077731783. The next prime is 18077731807. The reversal of 18077731802 is 20813777081.

It can be written as a sum of positive squares in 4 ways, for example, as 15355918561 + 2721813241 = 123919^2 + 52171^2 .

It is not an unprimeable number, because it can be changed into a prime (18077731807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9394949 + ... + 9396872.

Almost surely, 2^18077731802 is an apocalyptic number.

18077731802 is a deficient number, since it is larger than the sum of its proper divisors (11914016110).

18077731802 is a wasteful number, since it uses less digits than its factorization.

18077731802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18791873.

The product of its (nonzero) digits is 131712, while the sum is 44.

The spelling of 18077731802 in words is "eighteen billion, seventy-seven million, seven hundred thirty-one thousand, eight hundred two".