189021772368 has 720 divisors, whose sum is σ = 671001164288. Its totient is φ = 51116313600.

The previous prime is 189021772363. The next prime is 189021772411. The reversal of 189021772368 is 863277120981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189021772363) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 189590046 + ... + 189591042.

Almost surely, 2^189021772368 is an apocalyptic number.

189021772368 is a gapful number since it is divisible by the number (18) 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 189021772368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335500582144).

189021772368 is an abundant number, since it is smaller than the sum of its proper divisors (481979391920).

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

189021772368 is a wasteful number, since it uses less digits than its factorization.

189021772368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086 (or 1057 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 189021772368 in words is "one hundred eighty-nine billion, twenty-one million, seven hundred seventy-two thousand, three hundred sixty-eight".