64633955933689 has 2 divisors, whose sum is σ = 64633955933690. Its totient is φ = 64633955933688.

The previous prime is 64633955933639. The next prime is 64633955933713. The reversal of 64633955933689 is 98633955933646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61334083865664 + 3299872068025 = 7831608^2 + 1816555^2 .

It is a cyclic number.

It is not a de Polignac number, because 64633955933689 - 2¹¹ = 64633955931641 is a prime.

It is not a weakly prime, because it can be changed into another prime (64633955933639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32316977966844 + 32316977966845.

It is an arithmetic number, because the mean of its divisors is an integer number (32316977966845).

Almost surely, 2^{64633955933689} is an apocalyptic number.

It is an amenable number.

64633955933689 is a deficient number, since it is larger than the sum of its proper divisors (1).

64633955933689 is an equidigital number, since it uses as much as digits as its factorization.

64633955933689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10203667200, while the sum is 79.

The spelling of 64633955933689 in words is "sixty-four trillion, six hundred thirty-three billion, nine hundred fifty-five million, nine hundred thirty-three thousand, six hundred eighty-nine".