71664294271 has 2 divisors, whose sum is σ = 71664294272. Its totient is φ = 71664294270.

The previous prime is 71664294179. The next prime is 71664294277. The reversal of 71664294271 is 17249246617.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71664294271 - 2¹¹ = 71664292223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71664294277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35832147135 + 35832147136.

It is an arithmetic number, because the mean of its divisors is an integer number (35832147136).

Almost surely, 2^71664294271 is an apocalyptic number.

71664294271 is a deficient number, since it is larger than the sum of its proper divisors (1).

71664294271 is an equidigital number, since it uses as much as digits as its factorization.

71664294271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 49.

The spelling of 71664294271 in words is "seventy-one billion, six hundred sixty-four million, two hundred ninety-four thousand, two hundred seventy-one".