66505256 has 16 divisors (see below), whose sum is σ = 125536500. Its totient is φ = 33028864.

The previous prime is 66505253. The next prime is 66505279. The reversal of 66505256 is 65250566.

It can be written as a sum of positive squares in 2 ways, for example, as 52562500 + 13942756 = 7250^2 + 3734^2 .

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 3 ways as a sum of consecutive naturals, for example, 26705 + ... + 29088.

Almost surely, 2^66505256 is an apocalyptic number.

It is an amenable number.

66505256 is a deficient number, since it is larger than the sum of its proper divisors (59031244).

66505256 is a wasteful number, since it uses less digits than its factorization.

66505256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55948 (or 55944 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 66505256 is about 8155.0754748193. The cubic root of 66505256 is about 405.1526244860.

The spelling of 66505256 in words is "sixty-six million, five hundred five thousand, two hundred fifty-six".