66575057 has 2 divisors, whose sum is σ = 66575058. Its totient is φ = 66575056.

The previous prime is 66575027. The next prime is 66575063. The reversal of 66575057 is 75057566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66569281 + 5776 = 8159^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 66575057 - 2¹² = 66570961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66575027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33287528 + 33287529.

It is an arithmetic number, because the mean of its divisors is an integer number (33287529).

Almost surely, 2^66575057 is an apocalyptic number.

It is an amenable number.

66575057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66575057 is an equidigital number, since it uses as much as digits as its factorization.

66575057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 220500, while the sum is 41.

The square root of 66575057 is about 8159.3539572689. The cubic root of 66575057 is about 405.2943184010.

The spelling of 66575057 in words is "sixty-six million, five hundred seventy-five thousand, fifty-seven".