71668061 has 2 divisors, whose sum is σ = 71668062. Its totient is φ = 71668060.

The previous prime is 71668043. The next prime is 71668081. The reversal of 71668061 is 16086617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51696100 + 19971961 = 7190^2 + 4469^2 .

It is an emirp because it is prime and its reverse (16086617) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71668061 - 2¹⁴ = 71651677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71668021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35834030 + 35834031.

It is an arithmetic number, because the mean of its divisors is an integer number (35834031).

Almost surely, 2^71668061 is an apocalyptic number.

It is an amenable number.

71668061 is a deficient number, since it is larger than the sum of its proper divisors (1).

71668061 is an equidigital number, since it uses as much as digits as its factorization.

71668061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 71668061 is about 8465.6990851317. The cubic root of 71668061 is about 415.3764639259.

It can be divided in two parts, 7166 and 8061, that multiplied together give a triangular number (57765126 = T₁₀₇₄₈).

The spelling of 71668061 in words is "seventy-one million, six hundred sixty-eight thousand, sixty-one".