669524880025 has 27 divisors (see below), whose sum is σ = 858018283743. Its totient is φ = 518243653200.

The previous prime is 669524879923. The next prime is 669524880083. The reversal of 669524880025 is 520088425966.

The square root of 669524880025 is 818245.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 241028956809 + 428495923216 = 490947^2 + 654596^2 .

It is not a de Polignac number, because 669524880025 - 2²³ = 669516491417 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 126825336 + ... + 126830614.

Almost surely, 2^669524880025 is an apocalyptic number.

669524880025 is the 818245-th square number.

669524880025 is the 409123-rd centered octagonal number.

It is an amenable number.

669524880025 is a deficient number, since it is larger than the sum of its proper divisors (188493403718).

669524880025 is an frugal number, since it uses more digits than its factorization.

669524880025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10630 (or 5315 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 55.

The spelling of 669524880025 in words is "six hundred sixty-nine billion, five hundred twenty-four million, eight hundred eighty thousand, twenty-five".