18879697881 has 36 divisors (see below), whose sum is σ = 30008496336. Its totient is φ = 11429534160.

The previous prime is 18879697877. The next prime is 18879697883.

18879697881 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18879697881 - 2² = 18879697877 is a prime.

It is a super-2 number, since 2×18879697881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18879697883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1022130 + ... + 1040436.

Almost surely, 2^18879697881 is an apocalyptic number.

18879697881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18879697881 is a deficient number, since it is larger than the sum of its proper divisors (11128798455).

18879697881 is a wasteful number, since it uses less digits than its factorization.

18879697881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19282 (or 19268 counting only the distinct ones).

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

The spelling of 18879697881 in words is "eighteen billion, eight hundred seventy-nine million, six hundred ninety-seven thousand, eight hundred eighty-one".