669964445 has 4 divisors (see below), whose sum is σ = 803957340. Its totient is φ = 535971552.

The previous prime is 669964429. The next prime is 669964469. The reversal of 669964445 is 544469966.

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 377486041 + 292478404 = 19429^2 + 17102^2 .

It is a cyclic number.

It is not a de Polignac number, because 669964445 - 2⁴ = 669964429 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66996440 + ... + 66996449.

It is an arithmetic number, because the mean of its divisors is an integer number (200989335).

Almost surely, 2^669964445 is an apocalyptic number.

It is an amenable number.

669964445 is a deficient number, since it is larger than the sum of its proper divisors (133992895).

669964445 is a wasteful number, since it uses less digits than its factorization.

669964445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133992894.

The product of its digits is 5598720, while the sum is 53.

The square root of 669964445 is about 25883.6713972342. The cubic root of 669964445 is about 875.0185334850.

The spelling of 669964445 in words is "six hundred sixty-nine million, nine hundred sixty-four thousand, four hundred forty-five".