17919928811 has 4 divisors (see below), whose sum is σ = 17921748624. Its totient is φ = 17918109000.

The previous prime is 17919928801. The next prime is 17919928841. The reversal of 17919928811 is 11882991971.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 17919928811 - 2¹⁰ = 17919927787 is a prime.

It is a super-2 number, since 2×17919928811² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17919928801) 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, 895055 + ... + 914856.

It is an arithmetic number, because the mean of its divisors is an integer number (4480437156).

Almost surely, 2^17919928811 is an apocalyptic number.

17919928811 is a deficient number, since it is larger than the sum of its proper divisors (1819813).

17919928811 is an equidigital number, since it uses as much as digits as its factorization.

17919928811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1819812.

The product of its digits is 653184, while the sum is 56.

The spelling of 17919928811 in words is "seventeen billion, nine hundred nineteen million, nine hundred twenty-eight thousand, eight hundred eleven".