669137917 has 16 divisors (see below), whose sum is σ = 784409472. Its totient is φ = 558823680.

The previous prime is 669137897. The next prime is 669137923. The reversal of 669137917 is 719731966.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669137917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669137947) 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, 410458 + ... + 412084.

It is an arithmetic number, because the mean of its divisors is an integer number (49025592).

Almost surely, 2^669137917 is an apocalyptic number.

It is an amenable number.

669137917 is a deficient number, since it is larger than the sum of its proper divisors (115271555).

669137917 is a wasteful number, since it uses less digits than its factorization.

669137917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108.

The product of its digits is 428652, while the sum is 49.

The square root of 669137917 is about 25867.7002650023. The cubic root of 669137917 is about 874.6585517275.

The spelling of 669137917 in words is "six hundred sixty-nine million, one hundred thirty-seven thousand, nine hundred seventeen".