68657698591 has 4 divisors (see below), whose sum is σ = 68658239232. Its totient is φ = 68657157952.

The previous prime is 68657698583. The next prime is 68657698597. The reversal of 68657698591 is 19589675686.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68657698591 - 2³ = 68657698583 is a prime.

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 68657698591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68657698597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35490 + ... + 372256.

It is an arithmetic number, because the mean of its divisors is an integer number (17164559808).

Almost surely, 2^68657698591 is an apocalyptic number.

68657698591 is a deficient number, since it is larger than the sum of its proper divisors (540641).

68657698591 is a wasteful number, since it uses less digits than its factorization.

68657698591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540640.

The product of its digits is 195955200, while the sum is 70.

The spelling of 68657698591 in words is "sixty-eight billion, six hundred fifty-seven million, six hundred ninety-eight thousand, five hundred ninety-one".