68681955887 has 4 divisors (see below), whose sum is σ = 68699785320. Its totient is φ = 68664126456.

The previous prime is 68681955781. The next prime is 68681955889. The reversal of 68681955887 is 78855918686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68681955887 - 2¹⁶ = 68681890351 is a prime.

It is a super-2 number, since 2×68681955887² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68681955887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68681955889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8908937 + ... + 8916642.

It is an arithmetic number, because the mean of its divisors is an integer number (17174946330).

Almost surely, 2^68681955887 is an apocalyptic number.

68681955887 is a deficient number, since it is larger than the sum of its proper divisors (17829433).

68681955887 is a wasteful number, since it uses less digits than its factorization.

68681955887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17829432.

The product of its digits is 232243200, while the sum is 71.

The spelling of 68681955887 in words is "sixty-eight billion, six hundred eighty-one million, nine hundred fifty-five thousand, eight hundred eighty-seven".