66546399364553 has 2 divisors, whose sum is σ = 66546399364554. Its totient is φ = 66546399364552.

The previous prime is 66546399364453. The next prime is 66546399364597. The reversal of 66546399364553 is 35546399364566.

It is a happy number.

66546399364553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65801169451264 + 745229913289 = 8111792^2 + 863267^2 .

It is a cyclic number.

It is not a de Polignac number, because 66546399364553 - 2¹⁰ = 66546399363529 is a prime.

It is not a weakly prime, because it can be changed into another prime (66546399364153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33273199682276 + 33273199682277.

It is an arithmetic number, because the mean of its divisors is an integer number (33273199682277).

Almost surely, 2^{66546399364553} is an apocalyptic number.

It is an amenable number.

66546399364553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66546399364553 is an equidigital number, since it uses as much as digits as its factorization.

66546399364553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704000, while the sum is 74.

The spelling of 66546399364553 in words is "sixty-six trillion, five hundred forty-six billion, three hundred ninety-nine million, three hundred sixty-four thousand, five hundred fifty-three".