644526246104 has 128 divisors (see below), whose sum is σ = 1364142124800. Its totient is φ = 283527229440.

The previous prime is 644526246103. The next prime is 644526246113. The reversal of 644526246104 is 401642625446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644526246103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54006122 + ... + 54018054.

It is an arithmetic number, because the mean of its divisors is an integer number (10657360350).

Almost surely, 2^644526246104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644526246104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (682071062400).

644526246104 is an abundant number, since it is smaller than the sum of its proper divisors (719615878696).

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

644526246104 is a wasteful number, since it uses less digits than its factorization.

644526246104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12285 (or 12281 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 44.

The spelling of 644526246104 in words is "six hundred forty-four billion, five hundred twenty-six million, two hundred forty-six thousand, one hundred four".