19857879216 has 160 divisors (see below), whose sum is σ = 66246950400. Its totient is φ = 5577465600.

The previous prime is 19857879187. The next prime is 19857879227. The reversal of 19857879216 is 61297875891.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122766 + ... + 234066.

It is an arithmetic number, because the mean of its divisors is an integer number (414043440).

Almost surely, 2^19857879216 is an apocalyptic number.

19857879216 is a gapful number since it is divisible by the number (16) 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 19857879216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33123475200).

19857879216 is an abundant number, since it is smaller than the sum of its proper divisors (46389071184).

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

19857879216 is a wasteful number, since it uses less digits than its factorization.

19857879216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111384 (or 111372 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 63.

It can be divided in two parts, 1985787 and 9216, that added together give a triangular number (1995003 = T₁₉₉₇).

The spelling of 19857879216 in words is "nineteen billion, eight hundred fifty-seven million, eight hundred seventy-nine thousand, two hundred sixteen".