19933608813 has 4 divisors (see below), whose sum is σ = 26578145088. Its totient is φ = 13289072540.

The previous prime is 19933608787. The next prime is 19933608817. The reversal of 19933608813 is 31880633991.

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.

It is a cyclic number.

It is not a de Polignac number, because 19933608813 - 2¹⁶ = 19933543277 is a prime.

It is a super-2 number, since 2×19933608813² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19933608817) 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 3 ways as a sum of consecutive naturals, for example, 3322268133 + ... + 3322268138.

It is an arithmetic number, because the mean of its divisors is an integer number (6644536272).

Almost surely, 2^19933608813 is an apocalyptic number.

It is an amenable number.

19933608813 is a deficient number, since it is larger than the sum of its proper divisors (6644536275).

19933608813 is an equidigital number, since it uses as much as digits as its factorization.

19933608813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6644536274.

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 19933608813 in words is "nineteen billion, nine hundred thirty-three million, six hundred eight thousand, eight hundred thirteen".