19208851216 has 15 divisors (see below), whose sum is σ = 37218223381. Its totient is φ = 9604148416.

The previous prime is 19208851169. The next prime is 19208851231. The reversal of 19208851216 is 61215880291.

The square root of 19208851216 is 138596.

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

It can be written as a sum of positive squares in only one way, i.e., 3433491216 + 15775360000 = 58596^2 + 125600^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 537060 + ... + 571708.

Almost surely, 2^19208851216 is an apocalyptic number.

19208851216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19208851216 is the 138596-th square number.

It is an amenable number.

19208851216 is a deficient number, since it is larger than the sum of its proper divisors (18009372165).

19208851216 is an frugal number, since it uses more digits than its factorization.

19208851216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69306 (or 34651 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 43.

The spelling of 19208851216 in words is "nineteen billion, two hundred eight million, eight hundred fifty-one thousand, two hundred sixteen".