68731686551 has 8 divisors (see below), whose sum is σ = 75457603344. Its totient is φ = 62085366720.

The previous prime is 68731686509. The next prime is 68731686581. The reversal of 68731686551 is 15568613786.

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 68731686551 - 2¹⁸ = 68731424407 is a prime.

It is a super-2 number, since 2×68731686551² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68731686581) 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, 19897430 + ... + 19900883.

It is an arithmetic number, because the mean of its divisors is an integer number (9432200418).

Almost surely, 2^68731686551 is an apocalyptic number.

68731686551 is a deficient number, since it is larger than the sum of its proper divisors (6725916793).

68731686551 is a wasteful number, since it uses less digits than its factorization.

68731686551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39798481.

The product of its digits is 7257600, while the sum is 56.

The spelling of 68731686551 in words is "sixty-eight billion, seven hundred thirty-one million, six hundred eighty-six thousand, five hundred fifty-one".