16845849202561 has 24 divisors (see below), whose sum is σ = 17923868352000. Its totient is φ = 15829424116224.

The previous prime is 16845849202499. The next prime is 16845849202597. The reversal of 16845849202561 is 16520294854861.

It is not a de Polignac number, because 16845849202561 - 2⁷ = 16845849202433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16845849202561.

It is not an unprimeable number, because it can be changed into a prime (16845849202961) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469500420 + ... + 469536298.

It is an arithmetic number, because the mean of its divisors is an integer number (746827848000).

Almost surely, 2^{16845849202561} is an apocalyptic number.

It is an amenable number.

16845849202561 is a deficient number, since it is larger than the sum of its proper divisors (1078019149439).

16845849202561 is a wasteful number, since it uses less digits than its factorization.

16845849202561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38481 (or 38464 counting only the distinct ones).

The product of its (nonzero) digits is 33177600, while the sum is 61.

The spelling of 16845849202561 in words is "sixteen trillion, eight hundred forty-five billion, eight hundred forty-nine million, two hundred two thousand, five hundred sixty-one".