66636349609 has 2 divisors, whose sum is σ = 66636349610. Its totient is φ = 66636349608.

The previous prime is 66636349541. The next prime is 66636349667. The reversal of 66636349609 is 90694363666.

It is a happy number.

It is an a-pointer prime, because the next prime (66636349667) can be obtained adding 66636349609 to its sum of digits (58).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42943443984 + 23692905625 = 207228^2 + 153925^2 .

It is a cyclic number.

It is not a de Polignac number, because 66636349609 - 2¹³ = 66636341417 is a prime.

It is not a weakly prime, because it can be changed into another prime (66636349699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33318174804 + 33318174805.

It is an arithmetic number, because the mean of its divisors is an integer number (33318174805).

Almost surely, 2^66636349609 is an apocalyptic number.

It is an amenable number.

66636349609 is a deficient number, since it is larger than the sum of its proper divisors (1).

66636349609 is an equidigital number, since it uses as much as digits as its factorization.

66636349609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22674816, while the sum is 58.

The spelling of 66636349609 in words is "sixty-six billion, six hundred thirty-six million, three hundred forty-nine thousand, six hundred nine".