71265420217 has 2 divisors, whose sum is σ = 71265420218. Its totient is φ = 71265420216.

The previous prime is 71265420137. The next prime is 71265420253. The reversal of 71265420217 is 71202456217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68359239936 + 2906180281 = 261456^2 + 53909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71265420217 is a prime.

It is not a weakly prime, because it can be changed into another prime (71265420287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35632710108 + 35632710109.

It is an arithmetic number, because the mean of its divisors is an integer number (35632710109).

Almost surely, 2^71265420217 is an apocalyptic number.

It is an amenable number.

71265420217 is a deficient number, since it is larger than the sum of its proper divisors (1).

71265420217 is an equidigital number, since it uses as much as digits as its factorization.

71265420217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 71265420217 in words is "seventy-one billion, two hundred sixty-five million, four hundred twenty thousand, two hundred seventeen".