66575161 has 2 divisors, whose sum is σ = 66575162. Its totient is φ = 66575160.

The previous prime is 66575147. The next prime is 66575189. The reversal of 66575161 is 16157566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41525136 + 25050025 = 6444^2 + 5005^2 .

It is a cyclic number.

It is not a de Polignac number, because 66575161 - 2¹⁵ = 66542393 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66575161.

It is not a weakly prime, because it can be changed into another prime (66575101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33287580 + 33287581.

It is an arithmetic number, because the mean of its divisors is an integer number (33287581).

Almost surely, 2^66575161 is an apocalyptic number.

It is an amenable number.

66575161 is a deficient number, since it is larger than the sum of its proper divisors (1).

66575161 is an equidigital number, since it uses as much as digits as its factorization.

66575161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 37.

The square root of 66575161 is about 8159.3603303200. The cubic root of 66575161 is about 405.2945294439.

The spelling of 66575161 in words is "sixty-six million, five hundred seventy-five thousand, one hundred sixty-one".