19866836048 has 40 divisors (see below), whose sum is σ = 39974483880. Its totient is φ = 9553510400.

The previous prime is 19866836027. The next prime is 19866836051. The reversal of 19866836048 is 84063866891.

It can be written as a sum of positive squares in 4 ways, for example, as 9313794064 + 10553041984 = 96508^2 + 102728^2 .

It is a super-2 number, since 2×19866836048² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35948 + ... + 202548.

It is an arithmetic number, because the mean of its divisors is an integer number (999362097).

Almost surely, 2^19866836048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19866836048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19987241940).

19866836048 is an abundant number, since it is smaller than the sum of its proper divisors (20107647832).

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

19866836048 is a wasteful number, since it uses less digits than its factorization.

19866836048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166895 (or 166889 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 59.

The spelling of 19866836048 in words is "nineteen billion, eight hundred sixty-six million, eight hundred thirty-six thousand, forty-eight".