188966561816 has 32 divisors (see below), whose sum is σ = 354691807680. Its totient is φ = 94382150400.

The previous prime is 188966561809. The next prime is 188966561821. The reversal of 188966561816 is 618165669881.

It is a super-2 number, since 2×188966561816² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48738470 + ... + 48742346.

It is an arithmetic number, because the mean of its divisors is an integer number (11084118990).

Almost surely, 2^188966561816 is an apocalyptic number.

It is an amenable number.

188966561816 is a deficient number, since it is larger than the sum of its proper divisors (165725245864).

188966561816 is a wasteful number, since it uses less digits than its factorization.

188966561816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8835 (or 8831 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 65.

The spelling of 188966561816 in words is "one hundred eighty-eight billion, nine hundred sixty-six million, five hundred sixty-one thousand, eight hundred sixteen".