189911774268 has 36 divisors (see below), whose sum is σ = 480090978640. Its totient is φ = 63299149056.

The previous prime is 189911774257. The next prime is 189911774287. The reversal of 189911774268 is 862477119981.

189911774268 is a `hidden beast` number, since 1 + 8 + 99 + 117 + 7 + 426 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302121 + ... + 686367.

Almost surely, 2^189911774268 is an apocalyptic number.

189911774268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

189911774268 is an abundant number, since it is smaller than the sum of its proper divisors (290179204372).

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

189911774268 is a wasteful number, since it uses less digits than its factorization.

189911774268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397986 (or 397981 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The spelling of 189911774268 in words is "one hundred eighty-nine billion, nine hundred eleven million, seven hundred seventy-four thousand, two hundred sixty-eight".