68791631566 has 16 divisors (see below), whose sum is σ = 119144271456. Its totient is φ = 29178187776.

The previous prime is 68791631501. The next prime is 68791631581. The reversal of 68791631566 is 66513619786.

It is a super-2 number, since 2×68791631566² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68791631566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25326931 + ... + 25329646.

It is an arithmetic number, because the mean of its divisors is an integer number (7446516966).

Almost surely, 2^68791631566 is an apocalyptic number.

68791631566 is a deficient number, since it is larger than the sum of its proper divisors (50352639890).

68791631566 is a wasteful number, since it uses less digits than its factorization.

68791631566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50656683.

The product of its digits is 9797760, while the sum is 58.

The spelling of 68791631566 in words is "sixty-eight billion, seven hundred ninety-one million, six hundred thirty-one thousand, five hundred sixty-six".