669407845 has 8 divisors (see below), whose sum is σ = 806277240. Its totient is φ = 533534400.

The previous prime is 669407803. The next prime is 669407857. The reversal of 669407845 is 548704966.

It can be written as a sum of positive squares in 4 ways, for example, as 108618084 + 560789761 = 10422^2 + 23681^2 .

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

It is not a de Polignac number, because 669407845 - 2²⁹ = 132536933 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 247506 + ... + 250195.

It is an arithmetic number, because the mean of its divisors is an integer number (100784655).

Almost surely, 2^669407845 is an apocalyptic number.

It is an amenable number.

669407845 is a deficient number, since it is larger than the sum of its proper divisors (136869395).

669407845 is a wasteful number, since it uses less digits than its factorization.

669407845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497975.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 669407845 is about 25872.9172108597. The cubic root of 669407845 is about 874.7761473622.

The spelling of 669407845 in words is "six hundred sixty-nine million, four hundred seven thousand, eight hundred forty-five".