644106461141 has 32 divisors (see below), whose sum is σ = 771459292800. Its totient is φ = 529987910400.

The previous prime is 644106461101. The next prime is 644106461179. The reversal of 644106461141 is 141164601446.

It is a happy number.

It is not a de Polignac number, because 644106461141 - 2²² = 644102266837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 644106461095 and 644106461104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644106461101) 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, 12851711 + ... + 12901731.

It is an arithmetic number, because the mean of its divisors is an integer number (24108102900).

Almost surely, 2^644106461141 is an apocalyptic number.

It is an amenable number.

644106461141 is a deficient number, since it is larger than the sum of its proper divisors (127352831659).

644106461141 is a wasteful number, since it uses less digits than its factorization.

644106461141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51797.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 644106461141 in words is "six hundred forty-four billion, one hundred six million, four hundred sixty-one thousand, one hundred forty-one".