686161686 has 32 divisors (see below), whose sum is σ = 1574058240. Its totient is φ = 195335136.

The previous prime is 686161669. The next prime is 686161739.

It is a happy number.

686161686 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17856 + ... + 41123.

It is an arithmetic number, because the mean of its divisors is an integer number (49189320).

Almost surely, 2^686161686 is an apocalyptic number.

686161686 is an abundant number, since it is smaller than the sum of its proper divisors (887896554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686161686 is a wasteful number, since it uses less digits than its factorization.

686161686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59268.

The product of its digits is 497664, while the sum is 48.

The square root of 686161686 is about 26194.6881256487. The cubic root of 686161686 is about 882.0140191415.

The spelling of 686161686 in words is "six hundred eighty-six million, one hundred sixty-one thousand, six hundred eighty-six".