686268098569 has 9 divisors (see below), whose sum is σ = 709146434829. Its totient is φ = 664105565580.

The previous prime is 686268098563. The next prime is 686268098617. The reversal of 686268098569 is 965890862686.

The square root of 686268098569 is 828413.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 686268098569 - 2²⁵ = 686234544137 is a prime.

It is a super-2 number, since 2×686268098569² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686268098563) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25667442 + ... + 25694164.

Almost surely, 2^686268098569 is an apocalyptic number.

686268098569 is the 828413-rd square number.

686268098569 is the 414207-th centered octagonal number.

It is an amenable number.

686268098569 is a deficient number, since it is larger than the sum of its proper divisors (22878336260).

686268098569 is an frugal number, since it uses more digits than its factorization.

686268098569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53508 (or 26754 counting only the distinct ones).

The product of its (nonzero) digits is 537477120, while the sum is 73.

The spelling of 686268098569 in words is "six hundred eighty-six billion, two hundred sixty-eight million, ninety-eight thousand, five hundred sixty-nine".