16851121559 has 8 divisors (see below), whose sum is σ = 17134280688. Its totient is φ = 16568893440.

The previous prime is 16851121543. The next prime is 16851121561. The reversal of 16851121559 is 95512115861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16851121559 - 2⁴ = 16851121543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16851121579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196202 + ... + 268695.

It is an arithmetic number, because the mean of its divisors is an integer number (2141785086).

Almost surely, 2^16851121559 is an apocalyptic number.

16851121559 is a deficient number, since it is larger than the sum of its proper divisors (283159129).

16851121559 is an equidigital number, since it uses as much as digits as its factorization.

16851121559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465505.

The product of its digits is 108000, while the sum is 44.

The spelling of 16851121559 in words is "sixteen billion, eight hundred fifty-one million, one hundred twenty-one thousand, five hundred fifty-nine".