18976991050 has 48 divisors (see below), whose sum is σ = 36273894840. Its totient is φ = 7381013760.

The previous prime is 18976991017. The next prime is 18976991107. The reversal of 18976991050 is 5019967981.

It is a Cunningham number, because it is equal to 137757²+1.

It can be written as a sum of positive squares in 12 ways, for example, as 1 + 18976991049 = 1^2 + 137757^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18976990982 and 18976991000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5468716 + ... + 5472184.

Almost surely, 2^18976991050 is an apocalyptic number.

18976991050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18976991050 is a deficient number, since it is larger than the sum of its proper divisors (17296903790).

18976991050 is a wasteful number, since it uses less digits than its factorization.

18976991050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6475 (or 6470 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 55.

The spelling of 18976991050 in words is "eighteen billion, nine hundred seventy-six million, nine hundred ninety-one thousand, fifty".