644748000703 has 4 divisors (see below), whose sum is σ = 644749935480. Its totient is φ = 644746065928.

The previous prime is 644748000661. The next prime is 644748000707. The reversal of 644748000703 is 307000847446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 644748000703 - 2²¹ = 644745903551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 644748000703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644748000707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325600 + ... + 1181317.

It is an arithmetic number, because the mean of its divisors is an integer number (161187483870).

Almost surely, 2^644748000703 is an apocalyptic number.

644748000703 is a deficient number, since it is larger than the sum of its proper divisors (1934777).

644748000703 is a wasteful number, since it uses less digits than its factorization.

644748000703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934776.

The product of its (nonzero) digits is 451584, while the sum is 43.

The spelling of 644748000703 in words is "six hundred forty-four billion, seven hundred forty-eight million, seven hundred three", and thus it is an aban number.