686880064961 has 2 divisors, whose sum is σ = 686880064962. Its totient is φ = 686880064960.

The previous prime is 686880064907. The next prime is 686880064967. The reversal of 686880064961 is 169460088686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354210664336 + 332669400625 = 595156^2 + 576775^2 .

It is a cyclic number.

It is not a de Polignac number, because 686880064961 - 2¹⁴ = 686880048577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 686880064894 and 686880064903.

It is not a weakly prime, because it can be changed into another prime (686880064967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343440032480 + 343440032481.

It is an arithmetic number, because the mean of its divisors is an integer number (343440032481).

Almost surely, 2^686880064961 is an apocalyptic number.

It is an amenable number.

686880064961 is a deficient number, since it is larger than the sum of its proper divisors (1).

686880064961 is an equidigital number, since it uses as much as digits as its factorization.

686880064961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23887872, while the sum is 62.

The spelling of 686880064961 in words is "six hundred eighty-six billion, eight hundred eighty million, sixty-four thousand, nine hundred sixty-one".