18355664823720 has 256 divisors, whose sum is σ = 67788344033280. Its totient is φ = 3883706956800.

The previous prime is 18355664823701. The next prime is 18355664823721. The reversal of 18355664823720 is 2732846655381.

It is a super-2 number, since 2×18355664823720² (a number of 27 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (60) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (18355664823721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14725051 + ... + 15922890.

It is an arithmetic number, because the mean of its divisors is an integer number (264798218880).

Almost surely, 2^{18355664823720} is an apocalyptic number.

18355664823720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18355664823720 is an abundant number, since it is smaller than the sum of its proper divisors (49432679209560).

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

18355664823720 is a wasteful number, since it uses less digits than its factorization.

18355664823720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30648016 (or 30648012 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 60.

The spelling of 18355664823720 in words is "eighteen trillion, three hundred fifty-five billion, six hundred sixty-four million, eight hundred twenty-three thousand, seven hundred twenty".