665043525 has 18 divisors (see below), whose sum is σ = 1191167250. Its totient is φ = 354689760.

The previous prime is 665043517. The next prime is 665043557. The reversal of 665043525 is 525340566.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 215561124 + 449482401 = 14682^2 + 21201^2 .

It is not a de Polignac number, because 665043525 - 2³ = 665043517 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665043525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1477650 + ... + 1478099.

Almost surely, 2^665043525 is an apocalyptic number.

It is an amenable number.

665043525 is a deficient number, since it is larger than the sum of its proper divisors (526123725).

665043525 is a wasteful number, since it uses less digits than its factorization.

665043525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955765 (or 2955757 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The square root of 665043525 is about 25788.4378161997. The cubic root of 665043525 is about 872.8709161497.

The spelling of 665043525 in words is "six hundred sixty-five million, forty-three thousand, five hundred twenty-five".