686069957 has 2 divisors, whose sum is σ = 686069958. Its totient is φ = 686069956.

The previous prime is 686069941. The next prime is 686069977. The reversal of 686069957 is 759960686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599319361 + 86750596 = 24481^2 + 9314^2 .

It is a cyclic number.

It is not a de Polignac number, because 686069957 - 2⁴ = 686069941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686069927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343034978 + 343034979.

It is an arithmetic number, because the mean of its divisors is an integer number (343034979).

Almost surely, 2^686069957 is an apocalyptic number.

It is an amenable number.

686069957 is a deficient number, since it is larger than the sum of its proper divisors (1).

686069957 is an equidigital number, since it uses as much as digits as its factorization.

686069957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4898880, while the sum is 56.

The square root of 686069957 is about 26192.9371587075. The cubic root of 686069957 is about 881.9747136002.

The spelling of 686069957 in words is "six hundred eighty-six million, sixty-nine thousand, nine hundred fifty-seven".