18909918704 has 10 divisors (see below), whose sum is σ = 36637967520. Its totient is φ = 9454959344.

The previous prime is 18909918697. The next prime is 18909918751. The reversal of 18909918704 is 40781990981.

It is a self number, because there is not a number n which added to its sum of digits gives 18909918704.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 590934944 + ... + 590934975.

It is an arithmetic number, because the mean of its divisors is an integer number (3663796752).

Almost surely, 2^18909918704 is an apocalyptic number.

It is an amenable number.

18909918704 is a deficient number, since it is larger than the sum of its proper divisors (17728048816).

18909918704 is a wasteful number, since it uses less digits than its factorization.

18909918704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181869927 (or 1181869921 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 56.

The spelling of 18909918704 in words is "eighteen billion, nine hundred nine million, nine hundred eighteen thousand, seven hundred four".