669612365 has 4 divisors (see below), whose sum is σ = 803534844. Its totient is φ = 535689888.

The previous prime is 669612353. The next prime is 669612443. The reversal of 669612365 is 563216966.

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 154231561 + 515380804 = 12419^2 + 22702^2 .

It is a cyclic number.

It is not a de Polignac number, because 669612365 - 2⁶ = 669612301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66961232 + ... + 66961241.

It is an arithmetic number, because the mean of its divisors is an integer number (200883711).

Almost surely, 2^669612365 is an apocalyptic number.

It is an amenable number.

669612365 is a deficient number, since it is larger than the sum of its proper divisors (133922479).

669612365 is a wasteful number, since it uses less digits than its factorization.

669612365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133922478.

The product of its digits is 349920, while the sum is 44.

The square root of 669612365 is about 25876.8693044580. The cubic root of 669612365 is about 874.8652265893.

The spelling of 669612365 in words is "six hundred sixty-nine million, six hundred twelve thousand, three hundred sixty-five".