66395525 has 24 divisors (see below), whose sum is σ = 94410624. Its totient is φ = 45374400.

The previous prime is 66395509. The next prime is 66395531. The reversal of 66395525 is 52559366.

It is not a de Polignac number, because 66395525 - 2⁴ = 66395509 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80264 + ... + 81086.

It is an arithmetic number, because the mean of its divisors is an integer number (3933776).

Almost surely, 2^66395525 is an apocalyptic number.

It is an amenable number.

66395525 is a deficient number, since it is larger than the sum of its proper divisors (28015099).

66395525 is a wasteful number, since it uses less digits than its factorization.

66395525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301 (or 1296 counting only the distinct ones).

The product of its digits is 243000, while the sum is 41.

The square root of 66395525 is about 8148.3449239708. The cubic root of 66395525 is about 404.9296733042.

The spelling of 66395525 in words is "sixty-six million, three hundred ninety-five thousand, five hundred twenty-five".