686937840683 has 2 divisors, whose sum is σ = 686937840684. Its totient is φ = 686937840682.

The previous prime is 686937840679. The next prime is 686937840689. The reversal of 686937840683 is 386048739686.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 686937840683 - 2² = 686937840679 is a prime.

It is not a weakly prime, because it can be changed into another prime (686937840689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343468920341 + 343468920342.

It is an arithmetic number, because the mean of its divisors is an integer number (343468920342).

Almost surely, 2^686937840683 is an apocalyptic number.

686937840683 is a deficient number, since it is larger than the sum of its proper divisors (1).

686937840683 is an equidigital number, since it uses as much as digits as its factorization.

686937840683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 250822656, while the sum is 68.

The spelling of 686937840683 in words is "six hundred eighty-six billion, nine hundred thirty-seven million, eight hundred forty thousand, six hundred eighty-three".