18665975456 has 12 divisors (see below), whose sum is σ = 36748639242. Its totient is φ = 9332987712.

The previous prime is 18665975453. The next prime is 18665975467. The reversal of 18665975456 is 65457956681.

It can be written as a sum of positive squares in only one way, i.e., 15955731856 + 2710243600 = 126316^2 + 52060^2 .

It is not an unprimeable number, because it can be changed into a prime (18665975453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 291655835 + ... + 291655898.

Almost surely, 2^18665975456 is an apocalyptic number.

18665975456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18665975456 is a deficient number, since it is larger than the sum of its proper divisors (18082663786).

18665975456 is an equidigital number, since it uses as much as digits as its factorization.

18665975456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583311743 (or 583311735 counting only the distinct ones).

The product of its digits is 54432000, while the sum is 62.

The spelling of 18665975456 in words is "eighteen billion, six hundred sixty-five million, nine hundred seventy-five thousand, four hundred fifty-six".