669767965 has 4 divisors (see below), whose sum is σ = 803721564. Its totient is φ = 535814368.

The previous prime is 669767953. The next prime is 669767971. The reversal of 669767965 is 569767966.

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 270207844 + 399560121 = 16438^2 + 19989^2 .

It is a cyclic number.

It is not a de Polignac number, because 669767965 - 2⁵ = 669767933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66976792 + ... + 66976801.

It is an arithmetic number, because the mean of its divisors is an integer number (200930391).

Almost surely, 2^669767965 is an apocalyptic number.

It is an amenable number.

669767965 is a deficient number, since it is larger than the sum of its proper divisors (133953599).

669767965 is a wasteful number, since it uses less digits than its factorization.

669767965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133953598.

The product of its digits is 25719120, while the sum is 61.

The square root of 669767965 is about 25879.8756758992. The cubic root of 669767965 is about 874.9329864324.

Subtracting from 669767965 its reverse (569767966), we obtain a palindrome (99999999).

It can be divided in two parts, 6697679 and 65, that added together give a square (6697744 = 2588²).

The spelling of 669767965 in words is "six hundred sixty-nine million, seven hundred sixty-seven thousand, nine hundred sixty-five".