64345665 has 32 divisors (see below), whose sum is σ = 105114240. Its totient is φ = 33606144.

The previous prime is 64345639. The next prime is 64345691. The reversal of 64345665 is 56654346.

It is an interprime number because it is at equal distance from previous prime (64345639) and next prime (64345691).

It is not a de Polignac number, because 64345665 - 2⁷ = 64345537 is a prime.

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, 209442 + ... + 209748.

It is an arithmetic number, because the mean of its divisors is an integer number (3284820).

Almost surely, 2^64345665 is an apocalyptic number.

It is an amenable number.

64345665 is a deficient number, since it is larger than the sum of its proper divisors (40768575).

64345665 is a wasteful number, since it uses less digits than its factorization.

64345665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561.

The product of its digits is 259200, while the sum is 39.

The square root of 64345665 is about 8021.5749700417. The cubic root of 64345665 is about 400.7188428054.

The spelling of 64345665 in words is "sixty-four million, three hundred forty-five thousand, six hundred sixty-five".