686366811 has 64 divisors (see below), whose sum is σ = 1165248000. Its totient is φ = 395798400.

The previous prime is 686366777. The next prime is 686366831. The reversal of 686366811 is 118663686.

686366811 is a `hidden beast` number, since 6 + 8 + 636 + 6 + 8 + 1 + 1 = 666.

It is not a de Polignac number, because 686366811 - 2⁷ = 686366683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686366831) 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 in 63 ways as a sum of consecutive naturals, for example, 673060 + ... + 674078.

It is an arithmetic number, because the mean of its divisors is an integer number (18207000).

Almost surely, 2^686366811 is an apocalyptic number.

686366811 is a deficient number, since it is larger than the sum of its proper divisors (478881189).

686366811 is a wasteful number, since it uses less digits than its factorization.

686366811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161 (or 1155 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 686366811 is about 26198.6032261264. The cubic root of 686366811 is about 882.1019017809.

The spelling of 686366811 in words is "six hundred eighty-six million, three hundred sixty-six thousand, eight hundred eleven".