686366623 has 2 divisors, whose sum is σ = 686366624. Its totient is φ = 686366622.

The previous prime is 686366581. The next prime is 686366651. The reversal of 686366623 is 326663686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686366623 - 2²⁵ = 652812191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686366663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343183311 + 343183312.

It is an arithmetic number, because the mean of its divisors is an integer number (343183312).

Almost surely, 2^686366623 is an apocalyptic number.

686366623 is a deficient number, since it is larger than the sum of its proper divisors (1).

686366623 is an equidigital number, since it uses as much as digits as its factorization.

686366623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 46.

The square root of 686366623 is about 26198.5996381486. The cubic root of 686366623 is about 882.1018212432.

The spelling of 686366623 in words is "six hundred eighty-six million, three hundred sixty-six thousand, six hundred twenty-three".