18871686974881 has 16 divisors (see below), whose sum is σ = 20674287385920. Its totient is φ = 17119710861120.

The previous prime is 18871686974831. The next prime is 18871686974893. The reversal of 18871686974881 is 18847968617881.

It is a cyclic number.

It is not a de Polignac number, because 18871686974881 - 2⁹ = 18871686974369 is a prime.

It is a super-2 number, since 2×18871686974881² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18871686974795 and 18871686974804.

It is not an unprimeable number, because it can be changed into a prime (18871686974831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9308971 + ... + 11153488.

It is an arithmetic number, because the mean of its divisors is an integer number (1292142961620).

Almost surely, 2^{18871686974881} is an apocalyptic number.

It is an amenable number.

18871686974881 is a deficient number, since it is larger than the sum of its proper divisors (1802600411039).

18871686974881 is a wasteful number, since it uses less digits than its factorization.

18871686974881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20463696.

The product of its digits is 2080899072, while the sum is 82.

The spelling of 18871686974881 in words is "eighteen trillion, eight hundred seventy-one billion, six hundred eighty-six million, nine hundred seventy-four thousand, eight hundred eighty-one".