64663836646 has 32 divisors (see below), whose sum is σ = 98598977568. Its totient is φ = 31802641920.

The previous prime is 64663836641. The next prime is 64663836667.

64663836646 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64663836641) 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, 24010476 + ... + 24013168.

It is an arithmetic number, because the mean of its divisors is an integer number (3081218049).

Almost surely, 2^64663836646 is an apocalyptic number.

64663836646 is a deficient number, since it is larger than the sum of its proper divisors (33935140922).

64663836646 is a wasteful number, since it uses less digits than its factorization.

64663836646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576.

The product of its digits is 53747712, while the sum is 58.

The spelling of 64663836646 in words is "sixty-four billion, six hundred sixty-three million, eight hundred thirty-six thousand, six hundred forty-six".