19779312449 has 8 divisors (see below), whose sum is σ = 21392221032. Its totient is φ = 18179464320.

The previous prime is 19779312433. The next prime is 19779312451. The reversal of 19779312449 is 94421397791.

It can be written as a sum of positive squares in 4 ways, for example, as 829036849 + 18950275600 = 28793^2 + 137660^2 .

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 19779312449 - 2⁴ = 19779312433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19779312394 and 19779312403.

It is not an unprimeable number, because it can be changed into a prime (19779312479) 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, 3261962 + ... + 3268019.

It is an arithmetic number, because the mean of its divisors is an integer number (2674027629).

Almost surely, 2^19779312449 is an apocalyptic number.

It is an amenable number.

19779312449 is a deficient number, since it is larger than the sum of its proper divisors (1612908583).

19779312449 is a wasteful number, since it uses less digits than its factorization.

19779312449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6530227.

The product of its digits is 3429216, while the sum is 56.

The spelling of 19779312449 in words is "nineteen billion, seven hundred seventy-nine million, three hundred twelve thousand, four hundred forty-nine".