16851121560 has 288 divisors, whose sum is σ = 68609071440. Its totient is φ = 3555353088.

The previous prime is 16851121543. The next prime is 16851121561. The reversal of 16851121560 is 6512115861.

16851121560 is a `hidden beast` number, since 1 + 6 + 85 + 1 + 12 + 1 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16851121561) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 192579 + ... + 266061.

Almost surely, 2^16851121560 is an apocalyptic number.

16851121560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16851121560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34304535720).

16851121560 is an abundant number, since it is smaller than the sum of its proper divisors (51757949880).

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

16851121560 is a wasteful number, since it uses less digits than its factorization.

16851121560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73527 (or 73513 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 36.

The spelling of 16851121560 in words is "sixteen billion, eight hundred fifty-one million, one hundred twenty-one thousand, five hundred sixty".