66147071 has 2 divisors, whose sum is σ = 66147072. Its totient is φ = 66147070.

The previous prime is 66147049. The next prime is 66147077. The reversal of 66147071 is 17074166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66147071 - 2⁶ = 66147007 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 (66147077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33073535 + 33073536.

It is an arithmetic number, because the mean of its divisors is an integer number (33073536).

Almost surely, 2^66147071 is an apocalyptic number.

66147071 is a deficient number, since it is larger than the sum of its proper divisors (1).

66147071 is an equidigital number, since it uses as much as digits as its factorization.

66147071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 66147071 is about 8133.0849620547. The cubic root of 66147071 is about 404.4239557412.

The spelling of 66147071 in words is "sixty-six million, one hundred forty-seven thousand, seventy-one".