71561243186201 has 2 divisors, whose sum is σ = 71561243186202. Its totient is φ = 71561243186200.

The previous prime is 71561243186183. The next prime is 71561243186207. The reversal of 71561243186201 is 10268134216517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36755361264400 + 34805881921801 = 6062620^2 + 5899651^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71561243186201 is a prime.

It is not a weakly prime, because it can be changed into another prime (71561243186207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35780621593100 + 35780621593101.

It is an arithmetic number, because the mean of its divisors is an integer number (35780621593101).

Almost surely, 2^{71561243186201} is an apocalyptic number.

It is an amenable number.

71561243186201 is a deficient number, since it is larger than the sum of its proper divisors (1).

71561243186201 is an equidigital number, since it uses as much as digits as its factorization.

71561243186201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 71561243186201 in words is "seventy-one trillion, five hundred sixty-one billion, two hundred forty-three million, one hundred eighty-six thousand, two hundred one".