19911719160 has 256 divisors, whose sum is σ = 69465600000. Its totient is φ = 5063731200.

The previous prime is 19911719143. The next prime is 19911719189. The reversal of 19911719160 is 6191711991.

It is a super-2 number, since 2×19911719160² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9959841 + ... + 9961839.

It is an arithmetic number, because the mean of its divisors is an integer number (271350000).

Almost surely, 2^19911719160 is an apocalyptic number.

19911719160 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 19911719160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34732800000).

19911719160 is an abundant number, since it is smaller than the sum of its proper divisors (49553880840).

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

19911719160 is a wasteful number, since it uses less digits than its factorization.

19911719160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2443 (or 2433 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 45.

The spelling of 19911719160 in words is "nineteen billion, nine hundred eleven million, seven hundred nineteen thousand, one hundred sixty".