19809979611 has 8 divisors (see below), whose sum is σ = 26493105984. Its totient is φ = 13166753160.

The previous prime is 19809979591. The next prime is 19809979613. The reversal of 19809979611 is 11697990891.

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

It is not a de Polignac number, because 19809979611 - 2³⁰ = 18736237787 is a prime.

It is a super-2 number, since 2×19809979611² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19809979613) 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, 9973821 + ... + 9975806.

It is an arithmetic number, because the mean of its divisors is an integer number (3311638248).

Almost surely, 2^19809979611 is an apocalyptic number.

19809979611 is a deficient number, since it is larger than the sum of its proper divisors (6683126373).

19809979611 is a wasteful number, since it uses less digits than its factorization.

19809979611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19949961.

The product of its (nonzero) digits is 2204496, while the sum is 60.

The spelling of 19809979611 in words is "nineteen billion, eight hundred nine million, nine hundred seventy-nine thousand, six hundred eleven".