644122504543011 has 32 divisors (see below), whose sum is σ = 944822408463360. Its totient is φ = 387846733726464.

The previous prime is 644122504542931. The next prime is 644122504543043. The reversal of 644122504543011 is 110345405221446.

644122504543011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 644122504543011 - 2³³ = 644113914608419 is a prime.

It is a super-2 number, since 2×644122504543011² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (644122504543051) 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, 39567330 + ... + 53421143.

It is an arithmetic number, because the mean of its divisors is an integer number (29525700264480).

Almost surely, 2^{644122504543011} is an apocalyptic number.

644122504543011 is a deficient number, since it is larger than the sum of its proper divisors (300699903920349).

644122504543011 is a wasteful number, since it uses less digits than its factorization.

644122504543011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92992315.

The product of its (nonzero) digits is 460800, while the sum is 42.

Adding to 644122504543011 its reverse (110345405221446), we get a palindrome (754467909764457).

The spelling of 644122504543011 in words is "six hundred forty-four trillion, one hundred twenty-two billion, five hundred four million, five hundred forty-three thousand, eleven".