686370552677 has 2 divisors, whose sum is σ = 686370552678. Its totient is φ = 686370552676.

The previous prime is 686370552661. The next prime is 686370552811. The reversal of 686370552677 is 776255073686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535949911396 + 150420641281 = 732086^2 + 387841^2 .

It is a cyclic number.

It is not a de Polignac number, because 686370552677 - 2⁴ = 686370552661 is a prime.

It is a super-2 number, since 2×686370552677² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686370554677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343185276338 + 343185276339.

It is an arithmetic number, because the mean of its divisors is an integer number (343185276339).

Almost surely, 2^686370552677 is an apocalyptic number.

It is an amenable number.

686370552677 is a deficient number, since it is larger than the sum of its proper divisors (1).

686370552677 is an equidigital number, since it uses as much as digits as its factorization.

686370552677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 88905600, while the sum is 62.

The spelling of 686370552677 in words is "six hundred eighty-six billion, three hundred seventy million, five hundred fifty-two thousand, six hundred seventy-seven".