18723894064 has 10 divisors (see below), whose sum is σ = 36277544780. Its totient is φ = 9361947024.

The previous prime is 18723894053. The next prime is 18723894089. The reversal of 18723894064 is 46049832781.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585121674 + ... + 585121705.

It is an arithmetic number, because the mean of its divisors is an integer number (3627754478).

Almost surely, 2^18723894064 is an apocalyptic number.

It is an amenable number.

18723894064 is a deficient number, since it is larger than the sum of its proper divisors (17553650716).

18723894064 is a wasteful number, since it uses less digits than its factorization.

18723894064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170243387 (or 1170243381 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 18723894064 in words is "eighteen billion, seven hundred twenty-three million, eight hundred ninety-four thousand, sixty-four".