18238623639680 has 32 divisors (see below), whose sum is σ = 43601709640140. Its totient is φ = 7295449455616.

The previous prime is 18238623639667. The next prime is 18238623639763. The reversal of 18238623639680 is 8693632683281.

It can be written as a sum of positive squares in 2 ways, for example, as 17166968036416 + 1071655603264 = 4143304^2 + 1035208^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14248924079 + ... + 14248925358.

Almost surely, 2^{18238623639680} is an apocalyptic number.

18238623639680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18238623639680 is an abundant number, since it is smaller than the sum of its proper divisors (25363086000460).

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

18238623639680 is an equidigital number, since it uses as much as digits as its factorization.

18238623639680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28497849456 (or 28497849444 counting only the distinct ones).

The product of its (nonzero) digits is 107495424, while the sum is 65.

The spelling of 18238623639680 in words is "eighteen trillion, two hundred thirty-eight billion, six hundred twenty-three million, six hundred thirty-nine thousand, six hundred eighty".