66244525 has 6 divisors (see below), whose sum is σ = 82143242. Its totient is φ = 52995600.

The previous prime is 66244517. The next prime is 66244537. The reversal of 66244525 is 52544266.

It can be written as a sum of positive squares in 3 ways, for example, as 537289 + 65707236 = 733^2 + 8106^2 .

It is not a de Polignac number, because 66244525 - 2³ = 66244517 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 1324866 + ... + 1324915.

Almost surely, 2^66244525 is an apocalyptic number.

It is an amenable number.

66244525 is a deficient number, since it is larger than the sum of its proper divisors (15898717).

66244525 is a wasteful number, since it uses less digits than its factorization.

66244525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2649791 (or 2649786 counting only the distinct ones).

The product of its digits is 57600, while the sum is 34.

The square root of 66244525 is about 8139.0739645245. The cubic root of 66244525 is about 404.6224699103.

The spelling of 66244525 in words is "sixty-six million, two hundred forty-four thousand, five hundred twenty-five".