68979557638 has 8 divisors (see below), whose sum is σ = 103583417832. Its totient is φ = 34451751696.

The previous prime is 68979557609. The next prime is 68979557639. The reversal of 68979557638 is 83675597986.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 19011295 + ... + 19014922.

It is an arithmetic number, because the mean of its divisors is an integer number (12947927229).

Almost surely, 2^68979557638 is an apocalyptic number.

68979557638 is a deficient number, since it is larger than the sum of its proper divisors (34603860194).

68979557638 is a wasteful number, since it uses less digits than its factorization.

68979557638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38027126.

The product of its digits is 685843200, while the sum is 73.

The spelling of 68979557638 in words is "sixty-eight billion, nine hundred seventy-nine million, five hundred fifty-seven thousand, six hundred thirty-eight".