669628525 has 12 divisors (see below), whose sum is σ = 831134304. Its totient is φ = 535190000.

The previous prime is 669628517. The next prime is 669628541. The reversal of 669628525 is 525826966.

It is not a de Polignac number, because 669628525 - 2³ = 669628517 is a prime.

It is a super-2 number, since 2×669628525² = 896804722987351250, which contains 22 as substring.

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, 15000 + ... + 39550.

It is an arithmetic number, because the mean of its divisors is an integer number (69261192).

Almost surely, 2^669628525 is an apocalyptic number.

It is an amenable number.

669628525 is a deficient number, since it is larger than the sum of its proper divisors (161505779).

669628525 is a wasteful number, since it uses less digits than its factorization.

669628525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25652 (or 25647 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 49.

The square root of 669628525 is about 25877.1815505476. The cubic root of 669628525 is about 874.8722643468.

The spelling of 669628525 in words is "six hundred sixty-nine million, six hundred twenty-eight thousand, five hundred twenty-five".