66505252 has 24 divisors (see below), whose sum is σ = 127179360. Its totient is φ = 30178560.

The previous prime is 66505249. The next prime is 66505253. The reversal of 66505252 is 25250566.

It is not an unprimeable number, because it can be changed into a prime (66505253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40063 + ... + 41689.

It is an arithmetic number, because the mean of its divisors is an integer number (5299140).

Almost surely, 2^66505252 is an apocalyptic number.

It is an amenable number.

66505252 is a deficient number, since it is larger than the sum of its proper divisors (60674108).

66505252 is a wasteful number, since it uses less digits than its factorization.

66505252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2571 (or 2569 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 66505252 is about 8155.0752295733. The cubic root of 66505252 is about 405.1526163633.

The spelling of 66505252 in words is "sixty-six million, five hundred five thousand, two hundred fifty-two".