18547128956 has 6 divisors (see below), whose sum is σ = 32457475680. Its totient is φ = 9273564476.

The previous prime is 18547128949. The next prime is 18547128991. The reversal of 18547128956 is 65982174581.

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, 2318391116 + ... + 2318391123.

It is an arithmetic number, because the mean of its divisors is an integer number (5409579280).

Almost surely, 2^18547128956 is an apocalyptic number.

It is an amenable number.

18547128956 is a deficient number, since it is larger than the sum of its proper divisors (13910346724).

18547128956 is a wasteful number, since it uses less digits than its factorization.

18547128956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636782243 (or 4636782241 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 56.

The spelling of 18547128956 in words is "eighteen billion, five hundred forty-seven million, one hundred twenty-eight thousand, nine hundred fifty-six".