64765409491 has 2 divisors, whose sum is σ = 64765409492. Its totient is φ = 64765409490.

The previous prime is 64765409483. The next prime is 64765409551. The reversal of 64765409491 is 19490456746.

64765409491 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 is a cyclic number.

It is not a de Polignac number, because 64765409491 - 2³ = 64765409483 is a prime.

It is not a weakly prime, because it can be changed into another prime (64765403491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32382704745 + 32382704746.

It is an arithmetic number, because the mean of its divisors is an integer number (32382704746).

Almost surely, 2^64765409491 is an apocalyptic number.

64765409491 is a deficient number, since it is larger than the sum of its proper divisors (1).

64765409491 is an equidigital number, since it uses as much as digits as its factorization.

64765409491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 64765409491 in words is "sixty-four billion, seven hundred sixty-five million, four hundred nine thousand, four hundred ninety-one".