64640064003 has 16 divisors (see below), whose sum is σ = 86348021760. Its totient is φ = 43012815296.

The previous prime is 64640064001. The next prime is 64640064043. The reversal of 64640064003 is 30046004646.

It is a cyclic number.

It is not a de Polignac number, because 64640064003 - 2¹ = 64640064001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64640064001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4000126 + ... + 4016252.

It is an arithmetic number, because the mean of its divisors is an integer number (5396751360).

Almost surely, 2^64640064003 is an apocalyptic number.

64640064003 is a deficient number, since it is larger than the sum of its proper divisors (21707957757).

64640064003 is a wasteful number, since it uses less digits than its factorization.

64640064003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18546.

The product of its (nonzero) digits is 41472, while the sum is 33.

Adding to 64640064003 its reverse (30046004646), we get a palindrome (94686068649).

The spelling of 64640064003 in words is "sixty-four billion, six hundred forty million, sixty-four thousand, three".