18976991108 has 24 divisors (see below), whose sum is σ = 33843858048. Its totient is φ = 9307397216.

The previous prime is 18976991107. The next prime is 18976991113. The reversal of 18976991108 is 80119967981.

It is a super-2 number, since 2×18976991108² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18976991107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1448435 + ... + 1461477.

It is an arithmetic number, because the mean of its divisors is an integer number (1410160752).

Almost surely, 2^18976991108 is an apocalyptic number.

It is an amenable number.

18976991108 is a deficient number, since it is larger than the sum of its proper divisors (14866866940).

18976991108 is a wasteful number, since it uses less digits than its factorization.

18976991108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19963 (or 19961 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 59.

Subtracting from 18976991108 its sum of digits (59), we obtain a square (18976991049 = 137757²).

The spelling of 18976991108 in words is "eighteen billion, nine hundred seventy-six million, nine hundred ninety-one thousand, one hundred eight".