1644535028136 has 128 divisors (see below), whose sum is σ = 5520117657600. Its totient is φ = 394294106880.

The previous prime is 1644535028119. The next prime is 1644535028179. The reversal of 1644535028136 is 6318205354461.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34202896 + ... + 34250943.

It is an arithmetic number, because the mean of its divisors is an integer number (43125919200).

Almost surely, 2^{1644535028136} is an apocalyptic number.

It is an amenable number.

1644535028136 is an abundant number, since it is smaller than the sum of its proper divisors (3875582629464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1644535028136 is a wasteful number, since it uses less digits than its factorization.

1644535028136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68453879 (or 68453875 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 1644535028136 in words is "one trillion, six hundred forty-four billion, five hundred thirty-five million, twenty-eight thousand, one hundred thirty-six".