71561800278041 has 2 divisors, whose sum is σ = 71561800278042. Its totient is φ = 71561800278040.

The previous prime is 71561800278037. The next prime is 71561800278167. The reversal of 71561800278041 is 14087200816517.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61804298588041 + 9757501690000 = 7861571^2 + 3123700^2 .

It is an emirp because it is prime and its reverse (14087200816517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71561800278041 - 2² = 71561800278037 is a prime.

It is not a weakly prime, because it can be changed into another prime (71561800178041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35780900139020 + 35780900139021.

It is an arithmetic number, because the mean of its divisors is an integer number (35780900139021).

Almost surely, 2^{71561800278041} is an apocalyptic number.

It is an amenable number.

71561800278041 is a deficient number, since it is larger than the sum of its proper divisors (1).

71561800278041 is an equidigital number, since it uses as much as digits as its factorization.

71561800278041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 71561800278041 in words is "seventy-one trillion, five hundred sixty-one billion, eight hundred million, two hundred seventy-eight thousand, forty-one".