685552659 has 16 divisors (see below), whose sum is σ = 1055825280. Its totient is φ = 391045760.

The previous prime is 685552649. The next prime is 685552691. The reversal of 685552659 is 956255586.

It is a cyclic number.

It is not a de Polignac number, because 685552659 - 2¹¹ = 685550611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (685552649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610449 + ... + 611570.

It is an arithmetic number, because the mean of its divisors is an integer number (65989080).

Almost surely, 2^685552659 is an apocalyptic number.

685552659 is a deficient number, since it is larger than the sum of its proper divisors (370272621).

685552659 is a wasteful number, since it uses less digits than its factorization.

685552659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222050.

The product of its digits is 3240000, while the sum is 51.

The square root of 685552659 is about 26183.0605353920. The cubic root of 685552659 is about 881.7529876822.

The spelling of 685552659 in words is "six hundred eighty-five million, five hundred fifty-two thousand, six hundred fifty-nine".