19965853313 has 4 divisors (see below), whose sum is σ = 22818118080. Its totient is φ = 17113588548.

The previous prime is 19965853301. The next prime is 19965853343. The reversal of 19965853313 is 31335856991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31335856991 = 9421 ⋅3326171.

It is not a de Polignac number, because 19965853313 - 2⁸ = 19965853057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19965853343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1426132373 + ... + 1426132386.

It is an arithmetic number, because the mean of its divisors is an integer number (5704529520).

Almost surely, 2^19965853313 is an apocalyptic number.

It is an amenable number.

19965853313 is a deficient number, since it is larger than the sum of its proper divisors (2852264767).

19965853313 is an equidigital number, since it uses as much as digits as its factorization.

19965853313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852264766.

The product of its digits is 2624400, while the sum is 53.

The spelling of 19965853313 in words is "nineteen billion, nine hundred sixty-five million, eight hundred fifty-three thousand, three hundred thirteen".