64516181 has 2 divisors, whose sum is σ = 64516182. Its totient is φ = 64516180.

The previous prime is 64516169. The next prime is 64516253. The reversal of 64516181 is 18161546.

64516181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64144081 + 372100 = 8009^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 64516181 - 2¹⁸ = 64254037 is a prime.

It is a super-2 number, since 2×64516181² = 8324675221649522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64516141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32258090 + 32258091.

It is an arithmetic number, because the mean of its divisors is an integer number (32258091).

Almost surely, 2^64516181 is an apocalyptic number.

It is an amenable number.

64516181 is a deficient number, since it is larger than the sum of its proper divisors (1).

64516181 is an equidigital number, since it uses as much as digits as its factorization.

64516181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

The square root of 64516181 is about 8032.1965239902. The cubic root of 64516181 is about 401.0724988786.

The spelling of 64516181 in words is "sixty-four million, five hundred sixteen thousand, one hundred eighty-one".