686596640366 has 108 divisors (see below), whose sum is σ = 1356160512672. Its totient is φ = 259807740192.

The previous prime is 686596640363. The next prime is 686596640371. The reversal of 686596640366 is 663046695686.

It is a super-2 number, since 2×686596640366² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686596640363) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 8722115 + ... + 8800481.

It is an arithmetic number, because the mean of its divisors is an integer number (12557041784).

Almost surely, 2^686596640366 is an apocalyptic number.

686596640366 is a deficient number, since it is larger than the sum of its proper divisors (669563872306).

686596640366 is a wasteful number, since it uses less digits than its factorization.

686596640366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78455 (or 78412 counting only the distinct ones).

The product of its (nonzero) digits is 201553920, while the sum is 65.

The spelling of 686596640366 in words is "six hundred eighty-six billion, five hundred ninety-six million, six hundred forty thousand, three hundred sixty-six".