669565965 has 8 divisors (see below), whose sum is σ = 1071305568. Its totient is φ = 357101840.

The previous prime is 669565937. The next prime is 669565973. The reversal of 669565965 is 569565966.

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

It is not a de Polignac number, because 669565965 - 2⁷ = 669565837 is a prime.

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, 22318851 + ... + 22318880.

It is an arithmetic number, because the mean of its divisors is an integer number (133913196).

Almost surely, 2^669565965 is an apocalyptic number.

It is an amenable number.

669565965 is a deficient number, since it is larger than the sum of its proper divisors (401739603).

669565965 is a wasteful number, since it uses less digits than its factorization.

669565965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44637739.

The product of its digits is 13122000, while the sum is 57.

The square root of 669565965 is about 25875.9727353389. The cubic root of 669565965 is about 874.8450185374.

Subtracting from 669565965 its reverse (569565966), we obtain a palindrome (99999999).

The spelling of 669565965 in words is "six hundred sixty-nine million, five hundred sixty-five thousand, nine hundred sixty-five".