685987163 has 4 divisors (see below), whose sum is σ = 686468640. Its totient is φ = 685505688.

The previous prime is 685987147. The next prime is 685987193. The reversal of 685987163 is 361789586.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 685987163 - 2⁴ = 685987147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685987123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238595 + ... + 241452.

It is an arithmetic number, because the mean of its divisors is an integer number (171617160).

Almost surely, 2^685987163 is an apocalyptic number.

685987163 is a deficient number, since it is larger than the sum of its proper divisors (481477).

685987163 is a wasteful number, since it uses less digits than its factorization.

685987163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481476.

The product of its digits is 2177280, while the sum is 53.

The square root of 685987163 is about 26191.3566468024. The cubic root of 685987163 is about 881.9392336654.

The spelling of 685987163 in words is "six hundred eighty-five million, nine hundred eighty-seven thousand, one hundred sixty-three".