16813201203665 has 16 divisors (see below), whose sum is σ = 20646180834048. Its totient is φ = 13137035726976.

The previous prime is 16813201203647. The next prime is 16813201203763. The reversal of 16813201203665 is 56630210231861.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16813201203665 - 2¹⁴ = 16813201187281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1793549 + ... + 6069861.

It is an arithmetic number, because the mean of its divisors is an integer number (1290386302128).

Almost surely, 2^{16813201203665} is an apocalyptic number.

It is an amenable number.

16813201203665 is a deficient number, since it is larger than the sum of its proper divisors (3832979630383).

16813201203665 is a wasteful number, since it uses less digits than its factorization.

16813201203665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4294648.

The product of its (nonzero) digits is 311040, while the sum is 44.

The spelling of 16813201203665 in words is "sixteen trillion, eight hundred thirteen billion, two hundred one million, two hundred three thousand, six hundred sixty-five".