189770977188 has 72 divisors (see below), whose sum is σ = 518362281528. Its totient is φ = 58191740928.

The previous prime is 189770977183. The next prime is 189770977217. The reversal of 189770977188 is 881779077981.

It can be written as a sum of positive squares in 4 ways, for example, as 105100452864 + 84670524324 = 324192^2 + 290982^2 .

It is not an unprimeable number, because it can be changed into a prime (189770977183) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 554845 + ... + 829092.

Almost surely, 2^189770977188 is an apocalyptic number.

189770977188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

189770977188 is an abundant number, since it is smaller than the sum of its proper divisors (328591304340).

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

189770977188 is a wasteful number, since it uses less digits than its factorization.

189770977188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384253 (or 1384248 counting only the distinct ones).

The product of its (nonzero) digits is 99574272, while the sum is 72.

The spelling of 189770977188 in words is "one hundred eighty-nine billion, seven hundred seventy million, nine hundred seventy-seven thousand, one hundred eighty-eight".