18287401856 has 32 divisors (see below), whose sum is σ = 37688214600. Its totient is φ = 8828399104.

The previous prime is 18287401849. The next prime is 18287401889. The reversal of 18287401856 is 65810478281.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2459570 + ... + 2466993.

Almost surely, 2^18287401856 is an apocalyptic number.

18287401856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18287401856 is an abundant number, since it is smaller than the sum of its proper divisors (19400812744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18287401856 is an equidigital number, since it uses as much as digits as its factorization.

18287401856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4926606 (or 4926594 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 50.

The spelling of 18287401856 in words is "eighteen billion, two hundred eighty-seven million, four hundred one thousand, eight hundred fifty-six".