669819965 has 16 divisors (see below), whose sum is σ = 809400000. Its totient is φ = 532127232.

The previous prime is 669819929. The next prime is 669819967. The reversal of 669819965 is 569918966.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669819965 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669819967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535661 + ... + 536909.

It is an arithmetic number, because the mean of its divisors is an integer number (50587500).

Almost surely, 2^669819965 is an apocalyptic number.

It is an amenable number.

669819965 is a deficient number, since it is larger than the sum of its proper divisors (139580035).

669819965 is a wasteful number, since it uses less digits than its factorization.

669819965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916.

The product of its digits is 6298560, while the sum is 59.

The square root of 669819965 is about 25880.8802980115. The cubic root of 669819965 is about 874.9556287704.

Subtracting from 669819965 its reverse (569918966), we obtain a palindrome (99900999).

The spelling of 669819965 in words is "six hundred sixty-nine million, eight hundred nineteen thousand, nine hundred sixty-five".