664180065 has 12 divisors (see below), whose sum is σ = 1151245524. Its totient is φ = 354229344.

The previous prime is 664180063. The next prime is 664180067. The reversal of 664180065 is 560081466.

664180065 is a `hidden beast` number, since 6 + 641 + 8 + 0 + 0 + 6 + 5 = 666.

664180065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (664180063) and next prime (664180067).

It can be written as a sum of positive squares in 2 ways, for example, as 371872656 + 292307409 = 19284^2 + 17097^2 .

It is not a de Polignac number, because 664180065 - 2¹ = 664180063 is a prime.

It is a super-2 number, since 2×664180065² = 882270317486808450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664180063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7379734 + ... + 7379823.

It is an arithmetic number, because the mean of its divisors is an integer number (95937127).

Almost surely, 2^664180065 is an apocalyptic number.

It is an amenable number.

664180065 is a deficient number, since it is larger than the sum of its proper divisors (487065459).

664180065 is a wasteful number, since it uses less digits than its factorization.

664180065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14759568 (or 14759565 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 664180065 is about 25771.6911552191. The cubic root of 664180065 is about 872.4929882333.

The spelling of 664180065 in words is "six hundred sixty-four million, one hundred eighty thousand, sixty-five".