644652631225326 has 8 divisors (see below), whose sum is σ = 1289305262450664. Its totient is φ = 214884210408440.

The previous prime is 644652631225313. The next prime is 644652631225349. The reversal of 644652631225326 is 623522136256446.

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

644652631225326 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53721052602105 + ... + 53721052602116.

It is an arithmetic number, because the mean of its divisors is an integer number (161163157806333).

Almost surely, 2^{644652631225326} is an apocalyptic number.

644652631225326 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644652631225326 is a wasteful number, since it uses less digits than its factorization.

644652631225326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107442105204226.

The product of its digits is 74649600, while the sum is 57.

The spelling of 644652631225326 in words is "six hundred forty-four trillion, six hundred fifty-two billion, six hundred thirty-one million, two hundred twenty-five thousand, three hundred twenty-six".