64531359391 has 2 divisors, whose sum is σ = 64531359392. Its totient is φ = 64531359390.

The previous prime is 64531359379. The next prime is 64531359413. The reversal of 64531359391 is 19395313546.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64531359391 - 2⁵ = 64531359359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64531359791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32265679695 + 32265679696.

It is an arithmetic number, because the mean of its divisors is an integer number (32265679696).

Almost surely, 2^64531359391 is an apocalyptic number.

64531359391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64531359391 is an equidigital number, since it uses as much as digits as its factorization.

64531359391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1312200, while the sum is 49.

The spelling of 64531359391 in words is "sixty-four billion, five hundred thirty-one million, three hundred fifty-nine thousand, three hundred ninety-one".