66510566191 has 2 divisors, whose sum is σ = 66510566192. Its totient is φ = 66510566190.

The previous prime is 66510566149. The next prime is 66510566197. The reversal of 66510566191 is 19166501566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66510566191 - 2¹³ = 66510557999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66510566197) 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, 33255283095 + 33255283096.

It is an arithmetic number, because the mean of its divisors is an integer number (33255283096).

Almost surely, 2^66510566191 is an apocalyptic number.

66510566191 is a deficient number, since it is larger than the sum of its proper divisors (1).

66510566191 is an equidigital number, since it uses as much as digits as its factorization.

66510566191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 66510566191 in words is "sixty-six billion, five hundred ten million, five hundred sixty-six thousand, one hundred ninety-one".