685801917 has 8 divisors (see below), whose sum is σ = 1016002880. Its totient is φ = 457201260.

The previous prime is 685801901. The next prime is 685801937. The reversal of 685801917 is 719108586.

685801917 is a `hidden beast` number, since 68 + 580 + 1 + 9 + 1 + 7 = 666.

It is not a de Polignac number, because 685801917 - 2⁴ = 685801901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685801937) 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 7 ways as a sum of consecutive naturals, for example, 12700009 + ... + 12700062.

It is an arithmetic number, because the mean of its divisors is an integer number (127000360).

Almost surely, 2^685801917 is an apocalyptic number.

It is an amenable number.

685801917 is a deficient number, since it is larger than the sum of its proper divisors (330200963).

685801917 is a wasteful number, since it uses less digits than its factorization.

685801917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25400080 (or 25400074 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 685801917 is about 26187.8200123645. The cubic root of 685801917 is about 881.8598393597.

The spelling of 685801917 in words is "six hundred eighty-five million, eight hundred one thousand, nine hundred seventeen".