64205565 has 32 divisors (see below), whose sum is σ = 107377920. Its totient is φ = 32718336.

The previous prime is 64205551. The next prime is 64205573. The reversal of 64205565 is 56550246.

It is a happy number.

It is not a de Polignac number, because 64205565 - 2⁷ = 64205437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44089 + ... + 45521.

It is an arithmetic number, because the mean of its divisors is an integer number (3355560).

Almost surely, 2^64205565 is an apocalyptic number.

It is an amenable number.

64205565 is a deficient number, since it is larger than the sum of its proper divisors (43172355).

64205565 is a wasteful number, since it uses less digits than its factorization.

64205565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 64205565 is about 8012.8375123922. The cubic root of 64205565 is about 400.4278027156.

The spelling of 64205565 in words is "sixty-four million, two hundred five thousand, five hundred sixty-five".