644410544053641 has 32 divisors (see below), whose sum is σ = 892812282249600. Its totient is φ = 412940616184320.

The previous prime is 644410544053609. The next prime is 644410544053687. The reversal of 644410544053641 is 146350445014446.

It is not a de Polignac number, because 644410544053641 - 2⁵ = 644410544053609 is a prime.

It is a super-3 number, since 3×644410544053641³ (a number of 45 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (644410544073641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199440325 + ... + 202645661.

It is an arithmetic number, because the mean of its divisors is an integer number (27900383820300).

Almost surely, 2^{644410544053641} is an apocalyptic number.

It is an amenable number.

644410544053641 is a deficient number, since it is larger than the sum of its proper divisors (248401738195959).

644410544053641 is a wasteful number, since it uses less digits than its factorization.

644410544053641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3215689.

The product of its (nonzero) digits is 11059200, while the sum is 51.

The spelling of 644410544053641 in words is "six hundred forty-four trillion, four hundred ten billion, five hundred forty-four million, fifty-three thousand, six hundred forty-one".