644542024605 has 16 divisors (see below), whose sum is σ = 1048746346560. Its totient is φ = 337929377408.

The previous prime is 644542024561. The next prime is 644542024697. The reversal of 644542024605 is 506420245446.

644542024605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 644542024605 - 2³² = 640247057309 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364147152 + ... + 364148921.

It is an arithmetic number, because the mean of its divisors is an integer number (65546646660).

Almost surely, 2^644542024605 is an apocalyptic number.

It is an amenable number.

644542024605 is a deficient number, since it is larger than the sum of its proper divisors (404204321955).

644542024605 is a wasteful number, since it uses less digits than its factorization.

644542024605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728296140.

The product of its (nonzero) digits is 921600, while the sum is 42.

The spelling of 644542024605 in words is "six hundred forty-four billion, five hundred forty-two million, twenty-four thousand, six hundred five".