42664565 has 4 divisors (see below), whose sum is σ = 51197484. Its totient is φ = 34131648.

The previous prime is 42664547. The next prime is 42664603. The reversal of 42664565 is 56546624.

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 27227524 + 15437041 = 5218^2 + 3929^2 .

It is a cyclic number.

It is not a de Polignac number, because 42664565 - 2⁸ = 42664309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4266452 + ... + 4266461.

It is an arithmetic number, because the mean of its divisors is an integer number (12799371).

Almost surely, 2^42664565 is an apocalyptic number.

It is an amenable number.

42664565 is a deficient number, since it is larger than the sum of its proper divisors (8532919).

42664565 is an equidigital number, since it uses as much as digits as its factorization.

42664565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532918.

The product of its digits is 172800, while the sum is 38.

The square root of 42664565 is about 6531.8117700987. The cubic root of 42664565 is about 349.4264483786.

The spelling of 42664565 in words is "forty-two million, six hundred sixty-four thousand, five hundred sixty-five".