64565161 has 2 divisors, whose sum is σ = 64565162. Its totient is φ = 64565160.

The previous prime is 64565143. The next prime is 64565177. The reversal of 64565161 is 16156546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61779600 + 2785561 = 7860^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 64565161 - 2⁹ = 64564649 is a prime.

It is equal to p_3816493 and since 64565161 and 3816493 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (64565131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32282580 + 32282581.

It is an arithmetic number, because the mean of its divisors is an integer number (32282581).

Almost surely, 2^64565161 is an apocalyptic number.

It is an amenable number.

64565161 is a deficient number, since it is larger than the sum of its proper divisors (1).

64565161 is an equidigital number, since it uses as much as digits as its factorization.

64565161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 64565161 is about 8035.2449247052. The cubic root of 64565161 is about 401.1739698661.

The spelling of 64565161 in words is "sixty-four million, five hundred sixty-five thousand, one hundred sixty-one".