64857161 has 2 divisors, whose sum is σ = 64857162. Its totient is φ = 64857160.

The previous prime is 64857119. The next prime is 64857173. The reversal of 64857161 is 16175846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 295936 = 8035^2 + 544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64857161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64857061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32428580 + 32428581.

It is an arithmetic number, because the mean of its divisors is an integer number (32428581).

Almost surely, 2^64857161 is an apocalyptic number.

It is an amenable number.

64857161 is a deficient number, since it is larger than the sum of its proper divisors (1).

64857161 is an equidigital number, since it uses as much as digits as its factorization.

64857161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 38.

The square root of 64857161 is about 8053.3943775280. The cubic root of 64857161 is about 401.7778386014. Note that the first 3 decimals are identical.

The spelling of 64857161 in words is "sixty-four million, eight hundred fifty-seven thousand, one hundred sixty-one".