64236806861 has 2 divisors, whose sum is σ = 64236806862. Its totient is φ = 64236806860.

The previous prime is 64236806831. The next prime is 64236807007. The reversal of 64236806861 is 16860863246.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45969932836 + 18266874025 = 214406^2 + 135155^2 .

It is a cyclic number.

It is not a de Polignac number, because 64236806861 - 2³⁴ = 47056937677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64236806801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32118403430 + 32118403431.

It is an arithmetic number, because the mean of its divisors is an integer number (32118403431).

Almost surely, 2^64236806861 is an apocalyptic number.

It is an amenable number.

64236806861 is a deficient number, since it is larger than the sum of its proper divisors (1).

64236806861 is an equidigital number, since it uses as much as digits as its factorization.

64236806861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 64236806861 in words is "sixty-four billion, two hundred thirty-six million, eight hundred six thousand, eight hundred sixty-one".