2064918665 has 8 divisors (see below), whose sum is σ = 2486722248. Its totient is φ = 1646055040.

The previous prime is 2064918659. The next prime is 2064918673. The reversal of 2064918665 is 5668194602.

It can be written as a sum of positive squares in 4 ways, for example, as 476417929 + 1588500736 = 21827^2 + 39856^2 .

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

It is not a de Polignac number, because 2064918665 - 2⁶ = 2064918601 is a prime.

It is a super-4 number, since 4×2064918665⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 733442 + ... + 736251.

It is an arithmetic number, because the mean of its divisors is an integer number (310840281).

Almost surely, 2^2064918665 is an apocalyptic number.

It is an amenable number.

2064918665 is a deficient number, since it is larger than the sum of its proper divisors (421803583).

2064918665 is a wasteful number, since it uses less digits than its factorization.

2064918665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469979.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 2064918665 is about 45441.3761345318. The cubic root of 2064918665 is about 1273.4082229755.

The spelling of 2064918665 in words is "two billion, sixty-four million, nine hundred eighteen thousand, six hundred sixty-five".