64066813 has 2 divisors, whose sum is σ = 64066814. Its totient is φ = 64066812.

The previous prime is 64066811. The next prime is 64066837. The reversal of 64066813 is 31866046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46744569 + 17322244 = 6837^2 + 4162^2 .

It is a cyclic number.

It is not a de Polignac number, because 64066813 - 2¹ = 64066811 is a prime.

Together with 64066811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64066811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32033406 + 32033407.

It is an arithmetic number, because the mean of its divisors is an integer number (32033407).

Almost surely, 2^64066813 is an apocalyptic number.

It is an amenable number.

64066813 is a deficient number, since it is larger than the sum of its proper divisors (1).

64066813 is an equidigital number, since it uses as much as digits as its factorization.

64066813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 64066813 is about 8004.1747232304. The cubic root of 64066813 is about 400.1391453408.

The spelling of 64066813 in words is "sixty-four million, sixty-six thousand, eight hundred thirteen".