19456438813 has 8 divisors (see below), whose sum is σ = 22236782400. Its totient is φ = 16676308320.

The previous prime is 19456438787. The next prime is 19456438823. The reversal of 19456438813 is 31883465491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-19456438813 is a prime.

It is a super-2 number, since 2×19456438813² (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 (19456438823) 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 7 ways as a sum of consecutive naturals, for example, 289038 + ... + 349936.

It is an arithmetic number, because the mean of its divisors is an integer number (2779597800).

Almost surely, 2^19456438813 is an apocalyptic number.

It is an amenable number.

19456438813 is a deficient number, since it is larger than the sum of its proper divisors (2780343587).

19456438813 is an equidigital number, since it uses as much as digits as its factorization.

19456438813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106547.

The product of its digits is 2488320, while the sum is 52.

The spelling of 19456438813 in words is "nineteen billion, four hundred fifty-six million, four hundred thirty-eight thousand, eight hundred thirteen".