16851863358 has 72 divisors (see below), whose sum is σ = 40890946824. Its totient is φ = 5010239520.

The previous prime is 16851863351. The next prime is 16851863393. The reversal of 16851863358 is 85336815861.

16851863358 is a `hidden beast` number, since 1 + 68 + 518 + 63 + 3 + 5 + 8 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16851863351) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42441 + ... + 188427.

It is an arithmetic number, because the mean of its divisors is an integer number (567929817).

Almost surely, 2^16851863358 is an apocalyptic number.

16851863358 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16851863358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20445473412).

16851863358 is an abundant number, since it is smaller than the sum of its proper divisors (24039083466).

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

16851863358 is a wasteful number, since it uses less digits than its factorization.

16851863358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146070 (or 146056 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 16851863358 in words is "sixteen billion, eight hundred fifty-one million, eight hundred sixty-three thousand, three hundred fifty-eight".