68657689927 has 4 divisors (see below), whose sum is σ = 68662398456. Its totient is φ = 68652981400.

The previous prime is 68657689853. The next prime is 68657689987. The reversal of 68657689927 is 72998675686.

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 68657689927 - 2¹⁹ = 68657165639 is a prime.

It is a super-2 number, since 2×68657689927² (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 68657689927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68657689987) 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, 2332324 + ... + 2361577.

It is an arithmetic number, because the mean of its divisors is an integer number (17165599614).

Almost surely, 2^68657689927 is an apocalyptic number.

68657689927 is a deficient number, since it is larger than the sum of its proper divisors (4708529).

68657689927 is a wasteful number, since it uses less digits than its factorization.

68657689927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4708528.

The product of its digits is 548674560, while the sum is 73.

The spelling of 68657689927 in words is "sixty-eight billion, six hundred fifty-seven million, six hundred eighty-nine thousand, nine hundred twenty-seven".