644976493295 has 8 divisors (see below), whose sum is σ = 773994845760. Its totient is φ = 515965825440.

The previous prime is 644976493243. The next prime is 644976493297. The reversal of 644976493295 is 592394679446.

644976493295 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 644976493295 - 2⁸ = 644976493039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644976493297) 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, 1734860 + ... + 2073569.

It is an arithmetic number, because the mean of its divisors is an integer number (96749355720).

Almost surely, 2^644976493295 is an apocalyptic number.

644976493295 is a deficient number, since it is larger than the sum of its proper divisors (129018352465).

644976493295 is a wasteful number, since it uses less digits than its factorization.

644976493295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3842305.

The product of its digits is 352719360, while the sum is 68.

The spelling of 644976493295 in words is "six hundred forty-four billion, nine hundred seventy-six million, four hundred ninety-three thousand, two hundred ninety-five".