19568921445 has 12 divisors (see below), whose sum is σ = 33919463916. Its totient is φ = 10436758080.

The previous prime is 19568921443. The next prime is 19568921467. The reversal of 19568921445 is 54412986591.

19568921445 is a `hidden beast` number, since 19 + 568 + 9 + 21 + 4 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6252223041 + 13316698404 = 79071^2 + 115398^2 .

It is not a de Polignac number, because 19568921445 - 2¹ = 19568921443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19568921391 and 19568921400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19568921443) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217432416 + ... + 217432505.

It is an arithmetic number, because the mean of its divisors is an integer number (2826621993).

Almost surely, 2^19568921445 is an apocalyptic number.

19568921445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19568921445 is a deficient number, since it is larger than the sum of its proper divisors (14350542471).

19568921445 is a wasteful number, since it uses less digits than its factorization.

19568921445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434864932 (or 434864929 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 19568921445 in words is "nineteen billion, five hundred sixty-eight million, nine hundred twenty-one thousand, four hundred forty-five".