644749574710 has 8 divisors (see below), whose sum is σ = 1160549234496. Its totient is φ = 257899829880.

The previous prime is 644749574671. The next prime is 644749574743. The reversal of 644749574710 is 17475947446.

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

It is a super-3 number, since 3×644749574710³ (a number of 36 digits) contains 333 as substring.

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, 32237478726 + ... + 32237478745.

It is an arithmetic number, because the mean of its divisors is an integer number (145068654312).

Almost surely, 2^644749574710 is an apocalyptic number.

644749574710 is a deficient number, since it is larger than the sum of its proper divisors (515799659786).

644749574710 is a wasteful number, since it uses less digits than its factorization.

644749574710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64474957478.

The product of its (nonzero) digits is 23708160, while the sum is 58.

The spelling of 644749574710 in words is "six hundred forty-four billion, seven hundred forty-nine million, five hundred seventy-four thousand, seven hundred ten".