189709698456 has 128 divisors (see below), whose sum is σ = 540378820800. Its totient is φ = 61630848000.

The previous prime is 189709698443. The next prime is 189709698509. The reversal of 189709698456 is 654896907981.

189709698456 is a `hidden beast` number, since 1 + 89 + 7 + 0 + 9 + 6 + 98 + 456 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9031486 + ... + 9052466.

Almost surely, 2^189709698456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 189709698456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270189410400).

189709698456 is an abundant number, since it is smaller than the sum of its proper divisors (350669122344).

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

189709698456 is a wasteful number, since it uses less digits than its factorization.

189709698456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22058 (or 22048 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 72.

The spelling of 189709698456 in words is "one hundred eighty-nine billion, seven hundred nine million, six hundred ninety-eight thousand, four hundred fifty-six".