188555997420 has 480 divisors, whose sum is σ = 730417564800. Its totient is φ = 40561274880.

The previous prime is 188555997407. The next prime is 188555997449. The reversal of 188555997420 is 24799555881.

188555997420 is a `hidden beast` number, since 1 + 8 + 8 + 5 + 559 + 9 + 74 + 2 + 0 = 666.

188555997420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

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 159 ways as a sum of consecutive naturals, for example, 9436240 + ... + 9456200.

It is an arithmetic number, because the mean of its divisors is an integer number (1521703260).

Almost surely, 2^188555997420 is an apocalyptic number.

188555997420 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 188555997420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365208782400).

188555997420 is an abundant number, since it is smaller than the sum of its proper divisors (541861567380).

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

188555997420 is a wasteful number, since it uses less digits than its factorization.

188555997420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20020 (or 19995 counting only the distinct ones).

The product of its (nonzero) digits is 36288000, while the sum is 63.

The spelling of 188555997420 in words is "one hundred eighty-eight billion, five hundred fifty-five million, nine hundred ninety-seven thousand, four hundred twenty".