66505267 has 4 divisors (see below), whose sum is σ = 66525736. Its totient is φ = 66484800.

The previous prime is 66505253. The next prime is 66505279. The reversal of 66505267 is 76250566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66505267 - 2¹⁹ = 65980979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66505217) 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, 4158 + ... + 12259.

It is an arithmetic number, because the mean of its divisors is an integer number (16631434).

Almost surely, 2^66505267 is an apocalyptic number.

66505267 is a deficient number, since it is larger than the sum of its proper divisors (20469).

66505267 is a wasteful number, since it uses less digits than its factorization.

66505267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20468.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 66505267 is about 8155.0761492459. The cubic root of 66505267 is about 405.1526468235.

The spelling of 66505267 in words is "sixty-six million, five hundred five thousand, two hundred sixty-seven".