669664525 has 12 divisors (see below), whose sum is σ = 831719584. Its totient is φ = 534870000.

The previous prime is 669664483. The next prime is 669664547. The reversal of 669664525 is 525466966.

669664525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 669664525 - 2¹⁹ = 669140237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5451 + ... + 37000.

Almost surely, 2^669664525 is an apocalyptic number.

It is an amenable number.

669664525 is a deficient number, since it is larger than the sum of its proper divisors (162055059).

669664525 is a wasteful number, since it uses less digits than its factorization.

669664525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43092 (or 43087 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 49.

The square root of 669664525 is about 25877.8771347265. The cubic root of 669664525 is about 874.8879421124.

The spelling of 669664525 in words is "six hundred sixty-nine million, six hundred sixty-four thousand, five hundred twenty-five".