66644214613 has 2 divisors, whose sum is σ = 66644214614. Its totient is φ = 66644214612.

The previous prime is 66644214599. The next prime is 66644214619. The reversal of 66644214613 is 31641244666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57579841764 + 9064372849 = 239958^2 + 95207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66644214613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66644214613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66644214619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33322107306 + 33322107307.

It is an arithmetic number, because the mean of its divisors is an integer number (33322107307).

Almost surely, 2^66644214613 is an apocalyptic number.

It is an amenable number.

66644214613 is a deficient number, since it is larger than the sum of its proper divisors (1).

66644214613 is an equidigital number, since it uses as much as digits as its factorization.

66644214613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 43.

The spelling of 66644214613 in words is "sixty-six billion, six hundred forty-four million, two hundred fourteen thousand, six hundred thirteen".