66525161 has 2 divisors, whose sum is σ = 66525162. Its totient is φ = 66525160.

The previous prime is 66525143. The next prime is 66525203. The reversal of 66525161 is 16152566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52649536 + 13875625 = 7256^2 + 3725^2 .

It is a cyclic number.

It is not a de Polignac number, because 66525161 - 2¹⁸ = 66263017 is a prime.

It is not a weakly prime, because it can be changed into another prime (66525961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33262580 + 33262581.

It is an arithmetic number, because the mean of its divisors is an integer number (33262581).

Almost surely, 2^66525161 is an apocalyptic number.

It is an amenable number.

66525161 is a deficient number, since it is larger than the sum of its proper divisors (1).

66525161 is an equidigital number, since it uses as much as digits as its factorization.

66525161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 32.

The square root of 66525161 is about 8156.2957891435. The cubic root of 66525161 is about 405.1930411339.

The spelling of 66525161 in words is "sixty-six million, five hundred twenty-five thousand, one hundred sixty-one".