18766199944 has 16 divisors (see below), whose sum is σ = 35280964620. Its totient is φ = 9357942720.

The previous prime is 18766199911. The next prime is 18766199953. The reversal of 18766199944 is 44999166781.

It can be written as a sum of positive squares in 2 ways, for example, as 17066287044 + 1699912900 = 130638^2 + 41230^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3141487 + ... + 3147454.

Almost surely, 2^18766199944 is an apocalyptic number.

It is an amenable number.

18766199944 is a deficient number, since it is larger than the sum of its proper divisors (16514764676).

18766199944 is a wasteful number, since it uses less digits than its factorization.

18766199944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6289320 (or 6289316 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 64.

The spelling of 18766199944 in words is "eighteen billion, seven hundred sixty-six million, one hundred ninety-nine thousand, nine hundred forty-four".