64315665 has 24 divisors (see below), whose sum is σ = 117349440. Its totient is φ = 32495904.

The previous prime is 64315663. The next prime is 64315673. The reversal of 64315665 is 56651346.

64315665 is a `hidden beast` number, since 64 + 31 + 566 + 5 = 666.

It is not a de Polignac number, because 64315665 - 2¹ = 64315663 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64315661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36757 + ... + 38466.

It is an arithmetic number, because the mean of its divisors is an integer number (4889560).

Almost surely, 2^64315665 is an apocalyptic number.

It is an amenable number.

64315665 is a deficient number, since it is larger than the sum of its proper divisors (53033775).

64315665 is a wasteful number, since it uses less digits than its factorization.

64315665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75253 (or 75250 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 64315665 is about 8019.7047950657. The cubic root of 64315665 is about 400.6565571588.

It can be divided in two parts, 64315 and 665, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 64315665 in words is "sixty-four million, three hundred fifteen thousand, six hundred sixty-five".