64056665 has 4 divisors (see below), whose sum is σ = 76868004. Its totient is φ = 51245328.

The previous prime is 64056653. The next prime is 64056667. The reversal of 64056665 is 56665046.

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 10883401 + 53173264 = 3299^2 + 7292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64056665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64056667) 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, 6405662 + ... + 6405671.

It is an arithmetic number, because the mean of its divisors is an integer number (19217001).

Almost surely, 2^64056665 is an apocalyptic number.

It is an amenable number.

64056665 is a deficient number, since it is larger than the sum of its proper divisors (12811339).

64056665 is a wasteful number, since it uses less digits than its factorization.

64056665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12811338.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 64056665 is about 8003.5407789303. The cubic root of 64056665 is about 400.1180172597.

The spelling of 64056665 in words is "sixty-four million, fifty-six thousand, six hundred sixty-five".