664840282117 has 32 divisors (see below), whose sum is σ = 747739641600. Its totient is φ = 585884121600.

The previous prime is 664840282111. The next prime is 664840282153. The reversal of 664840282117 is 711282048466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664840282117 - 2³ = 664840282109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664840282111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52562688 + ... + 52575334.

It is an arithmetic number, because the mean of its divisors is an integer number (23366863800).

Almost surely, 2^664840282117 is an apocalyptic number.

It is an amenable number.

664840282117 is a deficient number, since it is larger than the sum of its proper divisors (82899359483).

664840282117 is a wasteful number, since it uses less digits than its factorization.

664840282117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13437.

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 664840282117 in words is "six hundred sixty-four billion, eight hundred forty million, two hundred eighty-two thousand, one hundred seventeen".