18686670016 has 56 divisors (see below), whose sum is σ = 42702333696. Its totient is φ = 7947413760.

The previous prime is 18686670007. The next prime is 18686670047. The reversal of 18686670016 is 61007668681.

It is a tau number, because it is divible by the number of its divisors (56).

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, 100516 + ... + 217891.

Almost surely, 2^18686670016 is an apocalyptic number.

18686670016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18686670016 is an abundant number, since it is smaller than the sum of its proper divisors (24015663680).

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

18686670016 is a wasteful number, since it uses less digits than its factorization.

18686670016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318557 (or 318547 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 18686670016 in words is "eighteen billion, six hundred eighty-six million, six hundred seventy thousand, sixteen".