669170917 has 4 divisors (see below), whose sum is σ = 669304876. Its totient is φ = 669036960.

The previous prime is 669170903. The next prime is 669170921. The reversal of 669170917 is 719071966.

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

It can be written as a sum of positive squares in 2 ways, for example, as 492440481 + 176730436 = 22191^2 + 13294^2 .

It is a cyclic number.

It is not a de Polignac number, because 669170917 - 2¹¹ = 669168869 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 (669170977) 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, 59184 + ... + 69577.

It is an arithmetic number, because the mean of its divisors is an integer number (167326219).

Almost surely, 2^669170917 is an apocalyptic number.

It is an amenable number.

669170917 is a deficient number, since it is larger than the sum of its proper divisors (133959).

669170917 is a wasteful number, since it uses less digits than its factorization.

669170917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133958.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 669170917 is about 25868.3381182480. The cubic root of 669170917 is about 874.6729300577.

The spelling of 669170917 in words is "six hundred sixty-nine million, one hundred seventy thousand, nine hundred seventeen".