188797981680 has 800 divisors, whose sum is σ = 831061237248. Its totient is φ = 38581401600.

The previous prime is 188797981621. The next prime is 188797981681. The reversal of 188797981680 is 86189797881.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 188797981599 and 188797981608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188797981681) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 30433459 + ... + 30439661.

Almost surely, 2^188797981680 is an apocalyptic number.

188797981680 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 188797981680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (415530618624).

188797981680 is an abundant number, since it is smaller than the sum of its proper divisors (642263255568).

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

188797981680 is a wasteful number, since it uses less digits than its factorization.

188797981680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6307 (or 6292 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 72.

The spelling of 188797981680 in words is "one hundred eighty-eight billion, seven hundred ninety-seven million, nine hundred eighty-one thousand, six hundred eighty".