64966661 has 2 divisors, whose sum is σ = 64966662. Its totient is φ = 64966660.

The previous prime is 64966637. The next prime is 64966703. The reversal of 64966661 is 16666946.

64966661 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 can be written as a sum of positive squares in only one way, i.e., 50481025 + 14485636 = 7105^2 + 3806^2 .

It is a cyclic number.

It is not a de Polignac number, because 64966661 - 2¹⁸ = 64704517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64966621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32483330 + 32483331.

It is an arithmetic number, because the mean of its divisors is an integer number (32483331).

Almost surely, 2^64966661 is an apocalyptic number.

It is an amenable number.

64966661 is a deficient number, since it is larger than the sum of its proper divisors (1).

64966661 is an equidigital number, since it uses as much as digits as its factorization.

64966661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 44.

The square root of 64966661 is about 8060.1898861007. The cubic root of 64966661 is about 402.0038220638.

The spelling of 64966661 in words is "sixty-four million, nine hundred sixty-six thousand, six hundred sixty-one".