68661257868 has 36 divisors (see below), whose sum is σ = 198354745680. Its totient is φ = 19617502176.

The previous prime is 68661257837. The next prime is 68661257887. The reversal of 68661257868 is 86875216686.

68661257868 is a `hidden beast` number, since 6 + 8 + 6 + 612 + 5 + 7 + 8 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136232403 + ... + 136232906.

Almost surely, 2^68661257868 is an apocalyptic number.

It is an amenable number.

68661257868 is an abundant number, since it is smaller than the sum of its proper divisors (129693487812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68661257868 is a wasteful number, since it uses less digits than its factorization.

68661257868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272465326 (or 272465321 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 68661257868 in words is "sixty-eight billion, six hundred sixty-one million, two hundred fifty-seven thousand, eight hundred sixty-eight".