66244569619 has 2 divisors, whose sum is σ = 66244569620. Its totient is φ = 66244569618.

The previous prime is 66244569593. The next prime is 66244569637. The reversal of 66244569619 is 91696544266.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66244569619 - 2⁹ = 66244569107 is a prime.

It is a super-2 number, since 2×66244569619² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66244569649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33122284809 + 33122284810.

It is an arithmetic number, because the mean of its divisors is an integer number (33122284810).

Almost surely, 2^66244569619 is an apocalyptic number.

66244569619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66244569619 is an equidigital number, since it uses as much as digits as its factorization.

66244569619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16796160, while the sum is 58.

The spelling of 66244569619 in words is "sixty-six billion, two hundred forty-four million, five hundred sixty-nine thousand, six hundred nineteen".