664122271 has 2 divisors, whose sum is σ = 664122272. Its totient is φ = 664122270.

The previous prime is 664122253. The next prime is 664122281. The reversal of 664122271 is 172221466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664122271 - 2²⁹ = 127251359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664122211) 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, 332061135 + 332061136.

It is an arithmetic number, because the mean of its divisors is an integer number (332061136).

Almost surely, 2^664122271 is an apocalyptic number.

664122271 is a deficient number, since it is larger than the sum of its proper divisors (1).

664122271 is an equidigital number, since it uses as much as digits as its factorization.

664122271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 664122271 is about 25770.5698617629. The cubic root of 664122271 is about 872.4676806774.

The spelling of 664122271 in words is "six hundred sixty-four million, one hundred twenty-two thousand, two hundred seventy-one".