64664636143 has 2 divisors, whose sum is σ = 64664636144. Its totient is φ = 64664636142.

The previous prime is 64664636129. The next prime is 64664636161. The reversal of 64664636143 is 34163646646.

64664636143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64664636143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64664636243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32332318071 + 32332318072.

It is an arithmetic number, because the mean of its divisors is an integer number (32332318072).

Almost surely, 2^64664636143 is an apocalyptic number.

64664636143 is a deficient number, since it is larger than the sum of its proper divisors (1).

64664636143 is an equidigital number, since it uses as much as digits as its factorization.

64664636143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4478976, while the sum is 49.

The spelling of 64664636143 in words is "sixty-four billion, six hundred sixty-four million, six hundred thirty-six thousand, one hundred forty-three".