64344844391 has 4 divisors (see below), whose sum is σ = 64345353072. Its totient is φ = 64344335712.

The previous prime is 64344844301. The next prime is 64344844411. The reversal of 64344844391 is 19344844346.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 64344844391 - 2³⁰ = 63271102567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64344844301) 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 in 3 ways as a sum of consecutive naturals, for example, 99350 + ... + 372236.

It is an arithmetic number, because the mean of its divisors is an integer number (16086338268).

Almost surely, 2^64344844391 is an apocalyptic number.

64344844391 is a deficient number, since it is larger than the sum of its proper divisors (508681).

64344844391 is a wasteful number, since it uses less digits than its factorization.

64344844391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508680.

The product of its digits is 3981312, while the sum is 50.

The spelling of 64344844391 in words is "sixty-four billion, three hundred forty-four million, eight hundred forty-four thousand, three hundred ninety-one".