18871583212 has 6 divisors (see below), whose sum is σ = 33025270628. Its totient is φ = 9435791604.

The previous prime is 18871583201. The next prime is 18871583231. The reversal of 18871583212 is 21238517881.

It is a super-2 number, since 2×18871583212² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2358947898 + ... + 2358947905.

Almost surely, 2^18871583212 is an apocalyptic number.

It is an amenable number.

18871583212 is a deficient number, since it is larger than the sum of its proper divisors (14153687416).

18871583212 is a wasteful number, since it uses less digits than its factorization.

18871583212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4717895807 (or 4717895805 counting only the distinct ones).

The product of its digits is 215040, while the sum is 46.

The spelling of 18871583212 in words is "eighteen billion, eight hundred seventy-one million, five hundred eighty-three thousand, two hundred twelve".