18897679881 has 12 divisors (see below), whose sum is σ = 27759304560. Its totient is φ = 12384919800.

The previous prime is 18897679877. The next prime is 18897679903.

18897679881 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18897679881 - 2² = 18897679877 is a prime.

It is a super-2 number, since 2×18897679881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18897679831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17793895 + ... + 17794956.

It is an arithmetic number, because the mean of its divisors is an integer number (2313275380).

Almost surely, 2^18897679881 is an apocalyptic number.

It is an amenable number.

18897679881 is a deficient number, since it is larger than the sum of its proper divisors (8861624679).

18897679881 is a wasteful number, since it uses less digits than its factorization.

18897679881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35588916 (or 35588913 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 72.

The spelling of 18897679881 in words is "eighteen billion, eight hundred ninety-seven million, six hundred seventy-nine thousand, eight hundred eighty-one".