18903991888 has 10 divisors (see below), whose sum is σ = 36626484314. Its totient is φ = 9451995936.

The previous prime is 18903991807. The next prime is 18903991901. The reversal of 18903991888 is 88819930981.

It can be written as a sum of positive squares in only one way, i.e., 11588953104 + 7315038784 = 107652^2 + 85528^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590749731 + ... + 590749762.

Almost surely, 2^18903991888 is an apocalyptic number.

It is an amenable number.

18903991888 is a deficient number, since it is larger than the sum of its proper divisors (17722492426).

18903991888 is a wasteful number, since it uses less digits than its factorization.

18903991888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181499501 (or 1181499495 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 64.

The spelling of 18903991888 in words is "eighteen billion, nine hundred three million, nine hundred ninety-one thousand, eight hundred eighty-eight".