644014541423 has 16 divisors (see below), whose sum is σ = 747626630400. Its totient is φ = 548259465600.

The previous prime is 644014541419. The next prime is 644014541441. The reversal of 644014541423 is 324145410446.

It is not a de Polignac number, because 644014541423 - 2² = 644014541419 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 (644014546423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8615873 + ... + 8690298.

It is an arithmetic number, because the mean of its divisors is an integer number (46726664400).

Almost surely, 2^644014541423 is an apocalyptic number.

644014541423 is a deficient number, since it is larger than the sum of its proper divisors (103612088977).

644014541423 is a wasteful number, since it uses less digits than its factorization.

644014541423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17306398.

The product of its (nonzero) digits is 184320, while the sum is 38.

Adding to 644014541423 its reverse (324145410446), we get a palindrome (968159951869).

The spelling of 644014541423 in words is "six hundred forty-four billion, fourteen million, five hundred forty-one thousand, four hundred twenty-three".