644141261253 has 16 divisors (see below), whose sum is σ = 1013211447296. Its totient is φ = 356207148720.

The previous prime is 644141261251. The next prime is 644141261279. The reversal of 644141261253 is 352162141446.

It is not a de Polignac number, because 644141261253 - 2¹ = 644141261251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644141261251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494731501 + ... + 494732802.

It is an arithmetic number, because the mean of its divisors is an integer number (63325715456).

Almost surely, 2^644141261253 is an apocalyptic number.

It is an amenable number.

644141261253 is a deficient number, since it is larger than the sum of its proper divisors (369070186043).

644141261253 is a wasteful number, since it uses less digits than its factorization.

644141261253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989464344.

The product of its digits is 138240, while the sum is 39.

The spelling of 644141261253 in words is "six hundred forty-four billion, one hundred forty-one million, two hundred sixty-one thousand, two hundred fifty-three".