68979557637 has 40 divisors (see below), whose sum is σ = 105506772800. Its totient is φ = 44912727720.

The previous prime is 68979557609. The next prime is 68979557639. The reversal of 68979557637 is 73675597986.

68979557637 is a `hidden beast` number, since 6 + 8 + 9 + 7 + 9 + 557 + 63 + 7 = 666.

It is not a de Polignac number, because 68979557637 - 2⁶ = 68979557573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68979557639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6434712 + ... + 6445422.

It is an arithmetic number, because the mean of its divisors is an integer number (2637669320).

Almost surely, 2^68979557637 is an apocalyptic number.

It is an amenable number.

68979557637 is a deficient number, since it is larger than the sum of its proper divisors (36527215163).

68979557637 is an frugal number, since it uses more digits than its factorization.

68979557637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10852 (or 10757 counting only the distinct ones).

The product of its digits is 600112800, while the sum is 72.

The spelling of 68979557637 in words is "sixty-eight billion, nine hundred seventy-nine million, five hundred fifty-seven thousand, six hundred thirty-seven".