188219431956 has 96 divisors (see below), whose sum is σ = 452951009280. Its totient is φ = 60797431296.

The previous prime is 188219431943. The next prime is 188219431957. The reversal of 188219431956 is 659134912881.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 188219431896 and 188219431905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188219431957) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34897996 + ... + 34903388.

It is an arithmetic number, because the mean of its divisors is an integer number (4718239680).

Almost surely, 2^188219431956 is an apocalyptic number.

188219431956 is the 231899-th nonagonal number.

It is an amenable number.

188219431956 is an abundant number, since it is smaller than the sum of its proper divisors (264731577324).

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

188219431956 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (188219431955) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (5963).

188219431956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5965 (or 5963 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 57.

The spelling of 188219431956 in words is "one hundred eighty-eight billion, two hundred nineteen million, four hundred thirty-one thousand, nine hundred fifty-six".