666523525 has 12 divisors (see below), whose sum is σ = 826943104. Its totient is φ = 532926000.

The previous prime is 666523519. The next prime is 666523537. The reversal of 666523525 is 525325666.

It is not a de Polignac number, because 666523525 - 2⁵ = 666523493 is a prime.

It is a Duffinian number.

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 11 ways as a sum of consecutive naturals, for example, 47020 + ... + 59530.

Almost surely, 2^666523525 is an apocalyptic number.

It is an amenable number.

666523525 is a deficient number, since it is larger than the sum of its proper divisors (160419579).

666523525 is a wasteful number, since it uses less digits than its factorization.

666523525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14652 (or 14647 counting only the distinct ones).

The product of its digits is 324000, while the sum is 40.

The square root of 666523525 is about 25817.1168994526. The cubic root of 666523525 is about 873.5179373791.

The spelling of 666523525 in words is "six hundred sixty-six million, five hundred twenty-three thousand, five hundred twenty-five".