19851015168 has 704 divisors, whose sum is σ = 67914547200. Its totient is φ = 5693276160.

The previous prime is 19851015143. The next prime is 19851015169. The reversal of 19851015168 is 86151015891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19851015169) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 374547430 + ... + 374547482.

Almost surely, 2^19851015168 is an apocalyptic number.

19851015168 is a gapful number since it is divisible by the number (18) 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 19851015168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33957273600).

19851015168 is an abundant number, since it is smaller than the sum of its proper divisors (48063532032).

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

19851015168 is a wasteful number, since it uses less digits than its factorization.

19851015168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 45.

The spelling of 19851015168 in words is "nineteen billion, eight hundred fifty-one million, fifteen thousand, one hundred sixty-eight".