187971886568 has 16 divisors (see below), whose sum is σ = 364600642500. Its totient is φ = 90745048576.

The previous prime is 187971886517. The next prime is 187971886577. The reversal of 187971886568 is 865688179781.

It can be written as a sum of positive squares in 2 ways, for example, as 185621382244 + 2350504324 = 430838^2 + 48482^2 .

It is a junction number, because it is equal to n+sod(n) for n = 187971886495 and 187971886504.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405111593 + ... + 405112056.

Almost surely, 2^187971886568 is an apocalyptic number.

It is an amenable number.

187971886568 is a deficient number, since it is larger than the sum of its proper divisors (176628755932).

187971886568 is a wasteful number, since it uses less digits than its factorization.

187971886568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810223684 (or 810223680 counting only the distinct ones).

The product of its digits is 325140480, while the sum is 74.

The spelling of 187971886568 in words is "one hundred eighty-seven billion, nine hundred seventy-one million, eight hundred eighty-six thousand, five hundred sixty-eight".