19513911220849 has 8 divisors (see below), whose sum is σ = 19544313762432. Its totient is φ = 19483510267920.

The previous prime is 19513911220777. The next prime is 19513911220883. The reversal of 19513911220849 is 94802211931591.

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 19513911220849 - 2¹⁹ = 19513910696561 is a prime.

It is a super-2 number, since 2×19513911220849² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19513911220849.

It is not an unprimeable number, because it can be changed into a prime (19513911220949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25502022 + ... + 26256064.

It is an arithmetic number, because the mean of its divisors is an integer number (2443039220304).

Almost surely, 2^{19513911220849} is an apocalyptic number.

It is an amenable number.

19513911220849 is a deficient number, since it is larger than the sum of its proper divisors (30402541583).

19513911220849 is an equidigital number, since it uses as much as digits as its factorization.

19513911220849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794327.

The product of its (nonzero) digits is 1399680, while the sum is 55.

The spelling of 19513911220849 in words is "nineteen trillion, five hundred thirteen billion, nine hundred eleven million, two hundred twenty thousand, eight hundred forty-nine".