71997222571 has 2 divisors, whose sum is σ = 71997222572. Its totient is φ = 71997222570.

The previous prime is 71997222569. The next prime is 71997222593. The reversal of 71997222571 is 17522279917.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71997222571 - 2¹ = 71997222569 is a prime.

It is a super-2 number, since 2×71997222571² (a number of 23 digits) contains 22 as substring.

Together with 71997222569, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71997222511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35998611285 + 35998611286.

It is an arithmetic number, because the mean of its divisors is an integer number (35998611286).

Almost surely, 2^71997222571 is an apocalyptic number.

71997222571 is a deficient number, since it is larger than the sum of its proper divisors (1).

71997222571 is an equidigital number, since it uses as much as digits as its factorization.

71997222571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1111320, while the sum is 52.

The spelling of 71997222571 in words is "seventy-one billion, nine hundred ninety-seven million, two hundred twenty-two thousand, five hundred seventy-one".