18487405856 has 12 divisors (see below), whose sum is σ = 36397080342. Its totient is φ = 9243702912.

The previous prime is 18487405823. The next prime is 18487405883. The reversal of 18487405856 is 65850478481.

It can be written as a sum of positive squares in only one way, i.e., 16670941456 + 1816464400 = 129116^2 + 42620^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 288865685 + ... + 288865748.

Almost surely, 2^18487405856 is an apocalyptic number.

18487405856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18487405856 is a deficient number, since it is larger than the sum of its proper divisors (17909674486).

18487405856 is an equidigital number, since it uses as much as digits as its factorization.

18487405856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577731443 (or 577731435 counting only the distinct ones).

The product of its (nonzero) digits is 8601600, while the sum is 56.

The spelling of 18487405856 in words is "eighteen billion, four hundred eighty-seven million, four hundred five thousand, eight hundred fifty-six".