664115161 has 2 divisors, whose sum is σ = 664115162. Its totient is φ = 664115160.

The previous prime is 664115147. The next prime is 664115203. The reversal of 664115161 is 161511466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643129600 + 20985561 = 25360^2 + 4581^2 .

It is a cyclic number.

It is not a de Polignac number, because 664115161 - 2⁵ = 664115129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664115141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332057580 + 332057581.

It is an arithmetic number, because the mean of its divisors is an integer number (332057581).

Almost surely, 2^664115161 is an apocalyptic number.

It is an amenable number.

664115161 is a deficient number, since it is larger than the sum of its proper divisors (1).

664115161 is an equidigital number, since it uses as much as digits as its factorization.

664115161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 31.

The square root of 664115161 is about 25770.4319133382. The cubic root of 664115161 is about 872.4645671607.

The spelling of 664115161 in words is "six hundred sixty-four million, one hundred fifteen thousand, one hundred sixty-one".