18871672216 has 16 divisors (see below), whose sum is σ = 35388764640. Its totient is φ = 9434668320.

The previous prime is 18871672187. The next prime is 18871672223. The reversal of 18871672216 is 61227617881.

It is a super-2 number, since 2×18871672216² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18871672216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75280 + ... + 208351.

It is an arithmetic number, because the mean of its divisors is an integer number (2211797790).

Almost surely, 2^18871672216 is an apocalyptic number.

It is an amenable number.

18871672216 is a deficient number, since it is larger than the sum of its proper divisors (16517092424).

18871672216 is a wasteful number, since it uses less digits than its factorization.

18871672216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291954 (or 291950 counting only the distinct ones).

The product of its digits is 451584, while the sum is 49.

The spelling of 18871672216 in words is "eighteen billion, eight hundred seventy-one million, six hundred seventy-two thousand, two hundred sixteen".