64999843 has 2 divisors, whose sum is σ = 64999844. Its totient is φ = 64999842.

The previous prime is 64999829. The next prime is 64999853. The reversal of 64999843 is 34899946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64999843 - 2⁵ = 64999811 is a prime.

It is not a weakly prime, because it can be changed into another prime (64999813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32499921 + 32499922.

It is an arithmetic number, because the mean of its divisors is an integer number (32499922).

Almost surely, 2^64999843 is an apocalyptic number.

64999843 is a deficient number, since it is larger than the sum of its proper divisors (1).

64999843 is an equidigital number, since it uses as much as digits as its factorization.

64999843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 52.

The square root of 64999843 is about 8062.2480115660. The cubic root of 64999843 is about 402.0722521387.

The spelling of 64999843 in words is "sixty-four million, nine hundred ninety-nine thousand, eight hundred forty-three".