19513826945 has 8 divisors (see below), whose sum is σ = 23429079144. Its totient is φ = 15602737024.

The previous prime is 19513826909. The next prime is 19513826963. The reversal of 19513826945 is 54962831591.

It can be written as a sum of positive squares in 4 ways, for example, as 7851554881 + 11662272064 = 88609^2 + 107992^2 .

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 19513826945 - 2²⁸ = 19245391489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1030244 + ... + 1049013.

It is an arithmetic number, because the mean of its divisors is an integer number (2928634893).

Almost surely, 2^19513826945 is an apocalyptic number.

It is an amenable number.

19513826945 is a deficient number, since it is larger than the sum of its proper divisors (3915252199).

19513826945 is a wasteful number, since it uses less digits than its factorization.

19513826945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081139.

The product of its digits is 2332800, while the sum is 53.

The spelling of 19513826945 in words is "nineteen billion, five hundred thirteen million, eight hundred twenty-six thousand, nine hundred forty-five".