1644162816204 has 36 divisors (see below), whose sum is σ = 4156271615496. Its totient is φ = 548028770688.

The previous prime is 1644162816203. The next prime is 1644162816229. The reversal of 1644162816204 is 4026182614461.

1644162816204 is a `hidden beast` number, since 1 + 6 + 4 + 4 + 1 + 628 + 16 + 2 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×1644162816204³ (a number of 38 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1644162816204.

It is not an unprimeable number, because it can be changed into a prime (1644162816203) 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, 270034 + ... + 1833369.

Almost surely, 2^{1644162816204} is an apocalyptic number.

It is an amenable number.

1644162816204 is an abundant number, since it is smaller than the sum of its proper divisors (2512108799292).

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

1644162816204 is a wasteful number, since it uses less digits than its factorization.

1644162816204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125126 (or 2125121 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 1644162816204 in words is "one trillion, six hundred forty-four billion, one hundred sixty-two million, eight hundred sixteen thousand, two hundred four".