66047161 has 2 divisors, whose sum is σ = 66047162. Its totient is φ = 66047160.

The previous prime is 66047153. The next prime is 66047209. The reversal of 66047161 is 16174066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57456400 + 8590761 = 7580^2 + 2931^2 .

It is a cyclic number.

It is not a de Polignac number, because 66047161 - 2³ = 66047153 is a prime.

It is not a weakly prime, because it can be changed into another prime (66047561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33023580 + 33023581.

It is an arithmetic number, because the mean of its divisors is an integer number (33023581).

Almost surely, 2^66047161 is an apocalyptic number.

It is an amenable number.

66047161 is a deficient number, since it is larger than the sum of its proper divisors (1).

66047161 is an equidigital number, since it uses as much as digits as its factorization.

66047161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 66047161 is about 8126.9404452106. The cubic root of 66047161 is about 404.2202361748.

The spelling of 66047161 in words is "sixty-six million, forty-seven thousand, one hundred sixty-one".