66452665 has 4 divisors (see below), whose sum is σ = 79743204. Its totient is φ = 53162128.

The previous prime is 66452627. The next prime is 66452669. The reversal of 66452665 is 56625466.

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 38700841 + 27751824 = 6221^2 + 5268^2 .

It is a cyclic number.

It is not a de Polignac number, because 66452665 - 2⁷ = 66452537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66452669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6645262 + ... + 6645271.

It is an arithmetic number, because the mean of its divisors is an integer number (19935801).

Almost surely, 2^66452665 is an apocalyptic number.

It is an amenable number.

66452665 is a deficient number, since it is larger than the sum of its proper divisors (13290539).

66452665 is a wasteful number, since it uses less digits than its factorization.

66452665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13290538.

The product of its digits is 259200, while the sum is 40.

The square root of 66452665 is about 8151.8504034360. The cubic root of 66452665 is about 405.0458008458.

The spelling of 66452665 in words is "sixty-six million, four hundred fifty-two thousand, six hundred sixty-five".