669381695 has 4 divisors (see below), whose sum is σ = 803258040. Its totient is φ = 535505352.

The previous prime is 669381623. The next prime is 669381701. The reversal of 669381695 is 596183966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669381695 - 2²⁰ = 668333119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66938165 + ... + 66938174.

It is an arithmetic number, because the mean of its divisors is an integer number (200814510).

Almost surely, 2^669381695 is an apocalyptic number.

669381695 is a deficient number, since it is larger than the sum of its proper divisors (133876345).

669381695 is a wasteful number, since it uses less digits than its factorization.

669381695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133876344.

The product of its digits is 2099520, while the sum is 53.

The square root of 669381695 is about 25872.4118512364. The cubic root of 669381695 is about 874.7647563523.

It can be divided in two parts, 669381 and 695, that added together give a palindrome (670076).

The spelling of 669381695 in words is "six hundred sixty-nine million, three hundred eighty-one thousand, six hundred ninety-five".