71666941 has 2 divisors, whose sum is σ = 71666942. Its totient is φ = 71666940.

The previous prime is 71666899. The next prime is 71666953. The reversal of 71666941 is 14966617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46376100 + 25290841 = 6810^2 + 5029^2 .

It is a cyclic number.

It is not a de Polignac number, because 71666941 - 2⁷ = 71666813 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71666894 and 71666903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71666981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35833470 + 35833471.

It is an arithmetic number, because the mean of its divisors is an integer number (35833471).

Almost surely, 2^71666941 is an apocalyptic number.

It is an amenable number.

71666941 is a deficient number, since it is larger than the sum of its proper divisors (1).

71666941 is an equidigital number, since it uses as much as digits as its factorization.

71666941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 71666941 is about 8465.6329355814. The cubic root of 71666941 is about 415.3743001351.

The spelling of 71666941 in words is "seventy-one million, six hundred sixty-six thousand, nine hundred forty-one".