19899616356 has 135 divisors (see below), whose sum is σ = 55381756507. Its totient is φ = 6229474560.

The previous prime is 19899616349. The next prime is 19899616367. The reversal of 19899616356 is 65361699891.

The square root of 19899616356 is 141066.

It is a perfect power (a square), and thus also a powerful number.

19899616356 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 9 + 616 + 3 + 5 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 248062500 + 19651553856 = 15750^2 + 140184^2 .

It is a super-2 number, since 2×19899616356² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (18895680) is a multiple of the sum of its prime factors (972).

It is a junction number, because it is equal to n+sod(n) for n = 19899616293 and 19899616302.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 43165966 + ... + 43166426.

Almost surely, 2^19899616356 is an apocalyptic number.

19899616356 is the 141066-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19899616356

19899616356 is an abundant number, since it is smaller than the sum of its proper divisors (35482140151).

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

19899616356 is an equidigital number, since it uses as much as digits as its factorization.

19899616356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972 (or 483 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The spelling of 19899616356 in words is "nineteen billion, eight hundred ninety-nine million, six hundred sixteen thousand, three hundred fifty-six".