68687208931 has 8 divisors (see below), whose sum is σ = 74937959424. Its totient is φ = 62437534920.

The previous prime is 68687208923. The next prime is 68687208937. The reversal of 68687208931 is 13980278686.

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

It is a cyclic number.

It is not a de Polignac number, because 68687208931 - 2³ = 68687208923 is a prime.

It is a super-2 number, since 2×68687208931² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68687208937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132691 + ... + 393676.

It is an arithmetic number, because the mean of its divisors is an integer number (9367244928).

Almost surely, 2^68687208931 is an apocalyptic number.

68687208931 is a deficient number, since it is larger than the sum of its proper divisors (6250750493).

68687208931 is a wasteful number, since it uses less digits than its factorization.

68687208931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538241.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The spelling of 68687208931 in words is "sixty-eight billion, six hundred eighty-seven million, two hundred eight thousand, nine hundred thirty-one".