64765358821 has 2 divisors, whose sum is σ = 64765358822. Its totient is φ = 64765358820.

The previous prime is 64765358809. The next prime is 64765358837. The reversal of 64765358821 is 12885356746.

It is a happy number.

64765358821 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., 57462801796 + 7302557025 = 239714^2 + 85455^2 .

It is a cyclic number.

It is not a de Polignac number, because 64765358821 - 2¹⁷ = 64765227749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64765358221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32382679410 + 32382679411.

It is an arithmetic number, because the mean of its divisors is an integer number (32382679411).

Almost surely, 2^64765358821 is an apocalyptic number.

It is an amenable number.

64765358821 is a deficient number, since it is larger than the sum of its proper divisors (1).

64765358821 is an equidigital number, since it uses as much as digits as its factorization.

64765358821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9676800, while the sum is 55.

The spelling of 64765358821 in words is "sixty-four billion, seven hundred sixty-five million, three hundred fifty-eight thousand, eight hundred twenty-one".