66695071 has 2 divisors, whose sum is σ = 66695072. Its totient is φ = 66695070.

The previous prime is 66695051. The next prime is 66695081. The reversal of 66695071 is 17059666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66695071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66695051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33347535 + 33347536.

It is an arithmetic number, because the mean of its divisors is an integer number (33347536).

Almost surely, 2^66695071 is an apocalyptic number.

66695071 is a deficient number, since it is larger than the sum of its proper divisors (1).

66695071 is an equidigital number, since it uses as much as digits as its factorization.

66695071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 66695071 is about 8166.7050271208. The cubic root of 66695071 is about 405.5377118259.

The spelling of 66695071 in words is "sixty-six million, six hundred ninety-five thousand, seventy-one".