680868813391 has 4 divisors (see below), whose sum is σ = 733243337512. Its totient is φ = 628494289272.

The previous prime is 680868813389. The next prime is 680868813467. The reversal of 680868813391 is 193318868086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193318868086 = 2 ⋅96659434043.

It is a cyclic number.

It is not a de Polignac number, because 680868813391 - 2¹ = 680868813389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680868813991) 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, 26187262041 + ... + 26187262066.

It is an arithmetic number, because the mean of its divisors is an integer number (183310834378).

Almost surely, 2^680868813391 is an apocalyptic number.

680868813391 is a deficient number, since it is larger than the sum of its proper divisors (52374524121).

680868813391 is a wasteful number, since it uses less digits than its factorization.

680868813391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52374524120.

The product of its (nonzero) digits is 11943936, while the sum is 61.

The spelling of 680868813391 in words is "six hundred eighty billion, eight hundred sixty-eight million, eight hundred thirteen thousand, three hundred ninety-one".