18976467981 has 16 divisors (see below), whose sum is σ = 26014457088. Its totient is φ = 12295483200.

The previous prime is 18976467977. The next prime is 18976468013.

It is a happy number.

18976467981 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18976467981 - 2² = 18976467977 is a prime.

It is a super-2 number, since 2×18976467981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18976467581) 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 15 ways as a sum of consecutive naturals, for example, 7291 + ... + 194951.

It is an arithmetic number, because the mean of its divisors is an integer number (1625903568).

Almost surely, 2^18976467981 is an apocalyptic number.

It is an amenable number.

18976467981 is a deficient number, since it is larger than the sum of its proper divisors (7037989107).

18976467981 is a wasteful number, since it uses less digits than its factorization.

18976467981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188612.

The product of its digits is 36578304, while the sum is 66.

The spelling of 18976467981 in words is "eighteen billion, nine hundred seventy-six million, four hundred sixty-seven thousand, nine hundred eighty-one".