669688826 has 8 divisors (see below), whose sum is σ = 1031682900. Its totient is φ = 325794528.

The previous prime is 669688813. The next prime is 669688841. The reversal of 669688826 is 628886966.

It can be written as a sum of positive squares in 2 ways, for example, as 668481025 + 1207801 = 25855^2 + 1099^2 .

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

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, 4524851 + ... + 4524998.

Almost surely, 2^669688826 is an apocalyptic number.

669688826 is a deficient number, since it is larger than the sum of its proper divisors (361994074).

669688826 is a wasteful number, since it uses less digits than its factorization.

669688826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9049888.

The product of its digits is 11943936, while the sum is 59.

The square root of 669688826 is about 25878.3466627990. The cubic root of 669688826 is about 874.8985247220.

The spelling of 669688826 in words is "six hundred sixty-nine million, six hundred eighty-eight thousand, eight hundred twenty-six".