644576451374 has 8 divisors (see below), whose sum is σ = 998053860288. Its totient is φ = 311891831280.

The previous prime is 644576451359. The next prime is 644576451377. The reversal of 644576451374 is 473154675446.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644576451377) by changing a digit.

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, 5198197127 + ... + 5198197250.

It is an arithmetic number, because the mean of its divisors is an integer number (124756732536).

Almost surely, 2^644576451374 is an apocalyptic number.

644576451374 is a deficient number, since it is larger than the sum of its proper divisors (353477408914).

644576451374 is a wasteful number, since it uses less digits than its factorization.

644576451374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10396394410.

The product of its digits is 33868800, while the sum is 56.

The spelling of 644576451374 in words is "six hundred forty-four billion, five hundred seventy-six million, four hundred fifty-one thousand, three hundred seventy-four".