669698765 has 8 divisors (see below), whose sum is σ = 850911480. Its totient is φ = 504243712.

The previous prime is 669698759. The next prime is 669698773. The reversal of 669698765 is 567896966.

It can be written as a sum of positive squares in 4 ways, for example, as 339222724 + 330476041 = 18418^2 + 18179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 669698765 - 2⁴ = 669698749 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669698698 and 669698707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3939320 + ... + 3939489.

It is an arithmetic number, because the mean of its divisors is an integer number (106363935).

Almost surely, 2^669698765 is an apocalyptic number.

It is an amenable number.

669698765 is a deficient number, since it is larger than the sum of its proper divisors (181212715).

669698765 is a wasteful number, since it uses less digits than its factorization.

669698765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878831.

The product of its digits is 29393280, while the sum is 62.

The square root of 669698765 is about 25878.5386952200. The cubic root of 669698765 is about 874.9028528881.

The spelling of 669698765 in words is "six hundred sixty-nine million, six hundred ninety-eight thousand, seven hundred sixty-five".