71326671051661 has 2 divisors, whose sum is σ = 71326671051662. Its totient is φ = 71326671051660.

The previous prime is 71326671051589. The next prime is 71326671051679. The reversal of 71326671051661 is 16615017662317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69630930585225 + 1695740466436 = 8344515^2 + 1302206^2 .

It is a cyclic number.

It is not a de Polignac number, because 71326671051661 - 2⁹ = 71326671051149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71326671051599 and 71326671051608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71326671051061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35663335525830 + 35663335525831.

It is an arithmetic number, because the mean of its divisors is an integer number (35663335525831).

Almost surely, 2^{71326671051661} is an apocalyptic number.

It is an amenable number.

71326671051661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71326671051661 is an equidigital number, since it uses as much as digits as its factorization.

71326671051661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 71326671051661 in words is "seventy-one trillion, three hundred twenty-six billion, six hundred seventy-one million, fifty-one thousand, six hundred sixty-one".