68679400808 has 8 divisors (see below), whose sum is σ = 128773876530. Its totient is φ = 34339700400.

The previous prime is 68679400807. The next prime is 68679400831. The reversal of 68679400808 is 80800497686.

It can be written as a sum of positive squares in only one way, i.e., 55855650244 + 12823750564 = 236338^2 + 113242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×68679400808² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68679400807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4292462543 + ... + 4292462558.

Almost surely, 2^68679400808 is an apocalyptic number.

It is an amenable number.

68679400808 is a deficient number, since it is larger than the sum of its proper divisors (60094475722).

68679400808 is a wasteful number, since it uses less digits than its factorization.

68679400808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8584925107 (or 8584925103 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 68679400808 in words is "sixty-eight billion, six hundred seventy-nine million, four hundred thousand, eight hundred eight".