669646365 has 16 divisors (see below), whose sum is σ = 1094231808. Its totient is φ = 349545536.

The previous prime is 669646321. The next prime is 669646381. The reversal of 669646365 is 563646966.

It is a cyclic number.

It is not a de Polignac number, because 669646365 - 2¹⁰ = 669645341 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 474222 + ... + 475631.

It is an arithmetic number, because the mean of its divisors is an integer number (68389488).

Almost surely, 2^669646365 is an apocalyptic number.

It is an amenable number.

669646365 is a deficient number, since it is larger than the sum of its proper divisors (424585443).

669646365 is a wasteful number, since it uses less digits than its factorization.

669646365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949908.

The product of its digits is 4199040, while the sum is 51.

The square root of 669646365 is about 25877.5262534888. The cubic root of 669646365 is about 874.8800336209.

The spelling of 669646365 in words is "six hundred sixty-nine million, six hundred forty-six thousand, three hundred sixty-five".