19471969764 has 81 divisors (see below), whose sum is σ = 53328085083. Its totient is φ = 5988026304.

The previous prime is 19471969723. The next prime is 19471969771. The reversal of 19471969764 is 46796917491.

The square root of 19471969764 is 139542.

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

19471969764 is a `hidden beast` number, since 1 + 9 + 471 + 96 + 9 + 76 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 480924900 + 18991044864 = 21930^2 + 137808^2 .

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 26 ways as a sum of consecutive naturals, for example, 10883382 + ... + 10885170.

Almost surely, 2^19471969764 is an apocalyptic number.

19471969764 is the 139542-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19471969764

19471969764 is an abundant number, since it is smaller than the sum of its proper divisors (33856115319).

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

19471969764 is a wasteful number, since it uses less digits than its factorization.

19471969764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614 (or 1807 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The spelling of 19471969764 in words is "nineteen billion, four hundred seventy-one million, nine hundred sixty-nine thousand, seven hundred sixty-four".