19715823945 has 12 divisors (see below), whose sum is σ = 34174094916. Its totient is φ = 10515106080.

The previous prime is 19715823937. The next prime is 19715823947. The reversal of 19715823945 is 54932851791.

It is a happy number.

19715823945 is a `hidden beast` number, since 19 + 7 + 1 + 582 + 3 + 9 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5990295609 + 13725528336 = 77397^2 + 117156^2 .

It is not a de Polignac number, because 19715823945 - 2³ = 19715823937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19715823891 and 19715823900.

It is not an unprimeable number, because it can be changed into a prime (19715823947) 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 11 ways as a sum of consecutive naturals, for example, 219064666 + ... + 219064755.

It is an arithmetic number, because the mean of its divisors is an integer number (2847841243).

Almost surely, 2^19715823945 is an apocalyptic number.

19715823945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19715823945 is a deficient number, since it is larger than the sum of its proper divisors (14458270971).

19715823945 is a wasteful number, since it uses less digits than its factorization.

19715823945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438129432 (or 438129429 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 54.

The spelling of 19715823945 in words is "nineteen billion, seven hundred fifteen million, eight hundred twenty-three thousand, nine hundred forty-five".