64665755543 has 2 divisors, whose sum is σ = 64665755544. Its totient is φ = 64665755542.

The previous prime is 64665755527. The next prime is 64665755563. The reversal of 64665755543 is 34555756646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64665755543 - 2⁴ = 64665755527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64665755563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32332877771 + 32332877772.

It is an arithmetic number, because the mean of its divisors is an integer number (32332877772).

Almost surely, 2^64665755543 is an apocalyptic number.

64665755543 is a deficient number, since it is larger than the sum of its proper divisors (1).

64665755543 is an equidigital number, since it uses as much as digits as its factorization.

64665755543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360000, while the sum is 56.

The spelling of 64665755543 in words is "sixty-four billion, six hundred sixty-five million, seven hundred fifty-five thousand, five hundred forty-three".