686405028667 has 2 divisors, whose sum is σ = 686405028668. Its totient is φ = 686405028666.

The previous prime is 686405028653. The next prime is 686405028679. The reversal of 686405028667 is 766820504686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686405028667 is a prime.

It is not a weakly prime, because it can be changed into another prime (686405028697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343202514333 + 343202514334.

It is an arithmetic number, because the mean of its divisors is an integer number (343202514334).

Almost surely, 2^686405028667 is an apocalyptic number.

686405028667 is a deficient number, since it is larger than the sum of its proper divisors (1).

686405028667 is an equidigital number, since it uses as much as digits as its factorization.

686405028667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23224320, while the sum is 58.

The spelling of 686405028667 in words is "six hundred eighty-six billion, four hundred five million, twenty-eight thousand, six hundred sixty-seven".