66571457 has 2 divisors, whose sum is σ = 66571458. Its totient is φ = 66571456.

The previous prime is 66571447. The next prime is 66571469. The reversal of 66571457 is 75417566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65141041 + 1430416 = 8071^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 66571457 - 2²⁰ = 65522881 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66571447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33285728 + 33285729.

It is an arithmetic number, because the mean of its divisors is an integer number (33285729).

Almost surely, 2^66571457 is an apocalyptic number.

It is an amenable number.

66571457 is a deficient number, since it is larger than the sum of its proper divisors (1).

66571457 is an equidigital number, since it uses as much as digits as its factorization.

66571457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 41.

The square root of 66571457 is about 8159.1333485855. The cubic root of 66571457 is about 405.2870129330.

The spelling of 66571457 in words is "sixty-six million, five hundred seventy-one thousand, four hundred fifty-seven".