19116380644 has 27 divisors (see below), whose sum is σ = 33954067497. Its totient is φ = 9417301344.

The previous prime is 19116380627. The next prime is 19116380659. The reversal of 19116380644 is 44608361191.

The square root of 19116380644 is 138262.

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., 10851388900 + 8264991744 = 104170^2 + 90912^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19116380644.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20185779 + ... + 20186725.

Almost surely, 2^19116380644 is an apocalyptic number.

19116380644 is the 138262-nd square number.

It is an amenable number.

19116380644 is a deficient number, since it is larger than the sum of its proper divisors (14837686853).

19116380644 is an frugal number, since it uses more digits than its factorization.

19116380644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044 (or 1022 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 19116380644 in words is "nineteen billion, one hundred sixteen million, three hundred eighty thousand, six hundred forty-four".