685161586 has 4 divisors (see below), whose sum is σ = 1027742382. Its totient is φ = 342580792.

The previous prime is 685161583. The next prime is 685161599.

685161586 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 496621225 + 188540361 = 22285^2 + 13731^2 .

It is not an unprimeable number, because it can be changed into a prime (685161583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171290395 + ... + 171290398.

Almost surely, 2^685161586 is an apocalyptic number.

685161586 is a deficient number, since it is larger than the sum of its proper divisors (342580796).

685161586 is a wasteful number, since it uses less digits than its factorization.

685161586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342580795.

The product of its digits is 345600, while the sum is 46.

The square root of 685161586 is about 26175.5914164322. The cubic root of 685161586 is about 881.5852906806.

The spelling of 685161586 in words is "six hundred eighty-five million, one hundred sixty-one thousand, five hundred eighty-six".