64656884693 has 2 divisors, whose sum is σ = 64656884694. Its totient is φ = 64656884692.

The previous prime is 64656884641. The next prime is 64656884797. The reversal of 64656884693 is 39648865646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40893737284 + 23763147409 = 202222^2 + 154153^2 .

It is a cyclic number.

It is not a de Polignac number, because 64656884693 - 2⁶ = 64656884629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64656884623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32328442346 + 32328442347.

It is an arithmetic number, because the mean of its divisors is an integer number (32328442347).

Almost surely, 2^64656884693 is an apocalyptic number.

It is an amenable number.

64656884693 is a deficient number, since it is larger than the sum of its proper divisors (1).

64656884693 is an equidigital number, since it uses as much as digits as its factorization.

64656884693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 179159040, while the sum is 65.

The spelling of 64656884693 in words is "sixty-four billion, six hundred fifty-six million, eight hundred eighty-four thousand, six hundred ninety-three".