18955644693420 has 192 divisors, whose sum is σ = 56235586176000. Its totient is φ = 4757438628864.

The previous prime is 18955644693409. The next prime is 18955644693467. The reversal of 18955644693420 is 2439644655981.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 260096746 + ... + 260169614.

It is an arithmetic number, because the mean of its divisors is an integer number (292893678000).

Almost surely, 2^{18955644693420} is an apocalyptic number.

18955644693420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18955644693420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28117793088000).

18955644693420 is an abundant number, since it is smaller than the sum of its proper divisors (37279941482580).

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

18955644693420 is a wasteful number, since it uses less digits than its factorization.

18955644693420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74392 (or 74390 counting only the distinct ones).

The product of its (nonzero) digits is 223948800, while the sum is 66.

The spelling of 18955644693420 in words is "eighteen trillion, nine hundred fifty-five billion, six hundred forty-four million, six hundred ninety-three thousand, four hundred twenty".