19766434213 has 4 divisors (see below), whose sum is σ = 19860114208. Its totient is φ = 19672754220.

The previous prime is 19766434189. The next prime is 19766434229. The reversal of 19766434213 is 31243466791.

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: 31243466791 = 19 ⋅1644392989.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19766434213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19766434243) 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, 46839681 + ... + 46840102.

It is an arithmetic number, because the mean of its divisors is an integer number (4965028552).

Almost surely, 2^19766434213 is an apocalyptic number.

It is an amenable number.

19766434213 is a deficient number, since it is larger than the sum of its proper divisors (93679995).

19766434213 is an equidigital number, since it uses as much as digits as its factorization.

19766434213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93679994.

The product of its digits is 653184, while the sum is 46.

The spelling of 19766434213 in words is "nineteen billion, seven hundred sixty-six million, four hundred thirty-four thousand, two hundred thirteen".