66564156271 has 2 divisors, whose sum is σ = 66564156272. Its totient is φ = 66564156270.

The previous prime is 66564156247. The next prime is 66564156289. The reversal of 66564156271 is 17265146566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66564156271 - 2⁷ = 66564156143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66564156371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33282078135 + 33282078136.

It is an arithmetic number, because the mean of its divisors is an integer number (33282078136).

Almost surely, 2^66564156271 is an apocalyptic number.

66564156271 is a deficient number, since it is larger than the sum of its proper divisors (1).

66564156271 is an equidigital number, since it uses as much as digits as its factorization.

66564156271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 49.

The spelling of 66564156271 in words is "sixty-six billion, five hundred sixty-four million, one hundred fifty-six thousand, two hundred seventy-one".