64243311365 has 8 divisors (see below), whose sum is σ = 77105436408. Its totient is φ = 51385673920.

The previous prime is 64243311361. The next prime is 64243311383. The reversal of 64243311365 is 56311334246.

64243311365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 633931684 + 63609379681 = 25178^2 + 252209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64243311365 - 2² = 64243311361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64243311361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1090322 + ... + 1147731.

It is an arithmetic number, because the mean of its divisors is an integer number (9638179551).

Almost surely, 2^64243311365 is an apocalyptic number.

It is an amenable number.

64243311365 is a deficient number, since it is larger than the sum of its proper divisors (12862125043).

64243311365 is a wasteful number, since it uses less digits than its factorization.

64243311365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2243799.

The product of its digits is 155520, while the sum is 38.

The spelling of 64243311365 in words is "sixty-four billion, two hundred forty-three million, three hundred eleven thousand, three hundred sixty-five".