66031265 has 4 divisors (see below), whose sum is σ = 79237524. Its totient is φ = 52825008.

The previous prime is 66031261. The next prime is 66031291. The reversal of 66031265 is 56213066.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15108769 + 50922496 = 3887^2 + 7136^2 .

It is a cyclic number.

It is not a de Polignac number, because 66031265 - 2² = 66031261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66031261) 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, 6603122 + ... + 6603131.

It is an arithmetic number, because the mean of its divisors is an integer number (19809381).

Almost surely, 2^66031265 is an apocalyptic number.

It is an amenable number.

66031265 is a deficient number, since it is larger than the sum of its proper divisors (13206259).

66031265 is a wasteful number, since it uses less digits than its factorization.

66031265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13206258.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 66031265 is about 8125.9624045402. The cubic root of 66031265 is about 404.1878048013.

The spelling of 66031265 in words is "sixty-six million, thirty-one thousand, two hundred sixty-five".