644273470534 has 8 divisors (see below), whose sum is σ = 966414409128. Its totient is φ = 322135334160.

The previous prime is 644273470523. The next prime is 644273470571. The reversal of 644273470534 is 435074372446.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24189 + ... + 1135399.

It is an arithmetic number, because the mean of its divisors is an integer number (120801801141).

Almost surely, 2^644273470534 is an apocalyptic number.

644273470534 is a deficient number, since it is larger than the sum of its proper divisors (322140938594).

644273470534 is a wasteful number, since it uses less digits than its factorization.

644273470534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401110.

The product of its (nonzero) digits is 6773760, while the sum is 49.

The spelling of 644273470534 in words is "six hundred forty-four billion, two hundred seventy-three million, four hundred seventy thousand, five hundred thirty-four".