64593809318 has 4 divisors (see below), whose sum is σ = 96890713980. Its totient is φ = 32296904658.

The previous prime is 64593809311. The next prime is 64593809323. The reversal of 64593809318 is 81390839546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64593809311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16148452328 + ... + 16148452331.

It is an arithmetic number, because the mean of its divisors is an integer number (24222678495).

Almost surely, 2^64593809318 is an apocalyptic number.

64593809318 is a deficient number, since it is larger than the sum of its proper divisors (32296904662).

64593809318 is a wasteful number, since it uses less digits than its factorization.

64593809318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32296904661.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 64593809318 in words is "sixty-four billion, five hundred ninety-three million, eight hundred nine thousand, three hundred eighteen".