18744746656 has 12 divisors (see below), whose sum is σ = 36903720042. Its totient is φ = 9372373312.

The previous prime is 18744746653. The next prime is 18744746729. The reversal of 18744746656 is 65664744781.

It can be written as a sum of positive squares in only one way, i.e., 11902810000 + 6841936656 = 109100^2 + 82716^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18744746656.

It is not an unprimeable number, because it can be changed into a prime (18744746653) 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, 292886635 + ... + 292886698.

Almost surely, 2^18744746656 is an apocalyptic number.

18744746656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18744746656 is a deficient number, since it is larger than the sum of its proper divisors (18158973386).

18744746656 is an equidigital number, since it uses as much as digits as its factorization.

18744746656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585773343 (or 585773335 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 58.

The spelling of 18744746656 in words is "eighteen billion, seven hundred forty-four million, seven hundred forty-six thousand, six hundred fifty-six".