64640064002 has 8 divisors (see below), whose sum is σ = 102663631116. Its totient is φ = 30418853632.

The previous prime is 64640064001. The next prime is 64640064043. The reversal of 64640064002 is 20046004646.

It can be written as a sum of positive squares in 2 ways, for example, as 59765091961 + 4874972041 = 244469^2 + 69821^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 64640064002.

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 3 ways as a sum of consecutive naturals, for example, 950589143 + ... + 950589210.

Almost surely, 2^64640064002 is an apocalyptic number.

64640064002 is a deficient number, since it is larger than the sum of its proper divisors (38023567114).

64640064002 is a wasteful number, since it uses less digits than its factorization.

64640064002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901178372.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 64640064002 its reverse (20046004646), we get a palindrome (84686068648).

The spelling of 64640064002 in words is "sixty-four billion, six hundred forty million, sixty-four thousand, two".