685226691 has 24 divisors (see below), whose sum is σ = 1005297696. Its totient is φ = 449677440.

The previous prime is 685226687. The next prime is 685226693. The reversal of 685226691 is 196622586.

685226691 is a `hidden beast` number, since 68 + 522 + 6 + 69 + 1 = 666.

It is not a de Polignac number, because 685226691 - 2² = 685226687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685226693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 645301 + ... + 646361.

It is an arithmetic number, because the mean of its divisors is an integer number (41887404).

Almost surely, 2^685226691 is an apocalyptic number.

685226691 is a deficient number, since it is larger than the sum of its proper divisors (320071005).

685226691 is a wasteful number, since it uses less digits than its factorization.

685226691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123 (or 2120 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 685226691 is about 26176.8350073113. The cubic root of 685226691 is about 881.6132129467.

The spelling of 685226691 in words is "six hundred eighty-five million, two hundred twenty-six thousand, six hundred ninety-one".