19779971348 has 12 divisors (see below), whose sum is σ = 34743631860. Its totient is φ = 9853219392.

The previous prime is 19779971347. The next prime is 19779971353. The reversal of 19779971348 is 84317997791.

It can be written as a sum of positive squares in 2 ways, for example, as 5927152144 + 13852819204 = 76988^2 + 117698^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19779971347) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9190361 + ... + 9192512.

It is an arithmetic number, because the mean of its divisors is an integer number (2895302655).

Almost surely, 2^19779971348 is an apocalyptic number.

It is an amenable number.

19779971348 is a deficient number, since it is larger than the sum of its proper divisors (14963660512).

19779971348 is a wasteful number, since it uses less digits than its factorization.

19779971348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18383146 (or 18383144 counting only the distinct ones).

The product of its digits is 24004512, while the sum is 65.

The spelling of 19779971348 in words is "nineteen billion, seven hundred seventy-nine million, nine hundred seventy-one thousand, three hundred forty-eight".