1644646325133 has 12 divisors (see below), whose sum is σ = 2550880014720. Its totient is φ = 939797899992.

The previous prime is 1644646325089. The next prime is 1644646325171. The reversal of 1644646325133 is 3315236464461.

It is not a de Polignac number, because 1644646325133 - 2¹² = 1644646321037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644646325173) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5594034973 + ... + 5594035266.

It is an arithmetic number, because the mean of its divisors is an integer number (212573334560).

Almost surely, 2^{1644646325133} is an apocalyptic number.

It is an amenable number.

1644646325133 is a deficient number, since it is larger than the sum of its proper divisors (906233689587).

1644646325133 is a wasteful number, since it uses less digits than its factorization.

1644646325133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11188070256 (or 11188070249 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 48.

The spelling of 1644646325133 in words is "one trillion, six hundred forty-four billion, six hundred forty-six million, three hundred twenty-five thousand, one hundred thirty-three".