669406676 has 12 divisors (see below), whose sum is σ = 1172937108. Its totient is φ = 334281792.

The previous prime is 669406669. The next prime is 669406679. The reversal of 669406676 is 676604966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 382984900 + 286421776 = 19570^2 + 16924^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669406679) 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 3 ways as a sum of consecutive naturals, for example, 101801 + ... + 108176.

It is an arithmetic number, because the mean of its divisors is an integer number (97744759).

Almost surely, 2^669406676 is an apocalyptic number.

It is an amenable number.

669406676 is a deficient number, since it is larger than the sum of its proper divisors (503530432).

669406676 is a wasteful number, since it uses less digits than its factorization.

669406676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210778 (or 210776 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 50.

The square root of 669406676 is about 25872.8946196594. The cubic root of 669406676 is about 874.7756381490.

The spelling of 669406676 in words is "six hundred sixty-nine million, four hundred six thousand, six hundred seventy-six".