18661372674 has 32 divisors (see below), whose sum is σ = 42665978880. Its totient is φ = 5330394192.

The previous prime is 18661372657. The next prime is 18661372733. The reversal of 18661372674 is 47627316681.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104737 + ... + 219755.

It is an arithmetic number, because the mean of its divisors is an integer number (1333311840).

Almost surely, 2^18661372674 is an apocalyptic number.

18661372674 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18661372674 is an abundant number, since it is smaller than the sum of its proper divisors (24004606206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18661372674 is a wasteful number, since it uses less digits than its factorization.

18661372674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118894.

The product of its digits is 2032128, while the sum is 51.

The spelling of 18661372674 in words is "eighteen billion, six hundred sixty-one million, three hundred seventy-two thousand, six hundred seventy-four".