19776794113 has 8 divisors (see below), whose sum is σ = 20371585832. Its totient is φ = 19185175296.

The previous prime is 19776794111. The next prime is 19776794129. The reversal of 19776794113 is 31149767791.

It can be written as a sum of positive squares in 4 ways, for example, as 3554186689 + 16222607424 = 59617^2 + 127368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19776794113 - 2¹ = 19776794111 is a prime.

It is a super-2 number, since 2×19776794113² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19776794111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780570 + ... + 805507.

It is an arithmetic number, because the mean of its divisors is an integer number (2546448229).

Almost surely, 2^19776794113 is an apocalyptic number.

It is an amenable number.

19776794113 is a deficient number, since it is larger than the sum of its proper divisors (594791719).

19776794113 is a wasteful number, since it uses less digits than its factorization.

19776794113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586451.

The product of its digits is 2000376, while the sum is 55.

The spelling of 19776794113 in words is "nineteen billion, seven hundred seventy-six million, seven hundred ninety-four thousand, one hundred thirteen".