66551302369 has 2 divisors, whose sum is σ = 66551302370. Its totient is φ = 66551302368.

The previous prime is 66551302361. The next prime is 66551302373. The reversal of 66551302369 is 96320315566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43488931600 + 23062370769 = 208540^2 + 151863^2 .

It is a cyclic number.

It is not a de Polignac number, because 66551302369 - 2³ = 66551302361 is a prime.

It is a super-2 number, since 2×66551302369² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66551302361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33275651184 + 33275651185.

It is an arithmetic number, because the mean of its divisors is an integer number (33275651185).

Almost surely, 2^66551302369 is an apocalyptic number.

It is an amenable number.

66551302369 is a deficient number, since it is larger than the sum of its proper divisors (1).

66551302369 is an equidigital number, since it uses as much as digits as its factorization.

66551302369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 46.

The spelling of 66551302369 in words is "sixty-six billion, five hundred fifty-one million, three hundred two thousand, three hundred sixty-nine".