64617565 has 8 divisors (see below), whose sum is σ = 78294528. Its totient is φ = 51191760.

The previous prime is 64617533. The next prime is 64617569. The reversal of 64617565 is 56571646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64617565 - 2⁵ = 64617533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64617569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62221 + ... + 63250.

It is an arithmetic number, because the mean of its divisors is an integer number (9786816).

Almost surely, 2^64617565 is an apocalyptic number.

It is an amenable number.

64617565 is a deficient number, since it is larger than the sum of its proper divisors (13676963).

64617565 is a wasteful number, since it uses less digits than its factorization.

64617565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125579.

The product of its digits is 151200, while the sum is 40.

The square root of 64617565 is about 8038.5051471029. The cubic root of 64617565 is about 401.2824774843.

The spelling of 64617565 in words is "sixty-four million, six hundred seventeen thousand, five hundred sixty-five".