19979314871 has 16 divisors (see below), whose sum is σ = 21059232768. Its totient is φ = 18934423200.

The previous prime is 19979314867. The next prime is 19979314909. The reversal of 19979314871 is 17841397991.

It is a cyclic number.

It is not a de Polignac number, because 19979314871 - 2² = 19979314867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19979314871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19979314841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172226 + ... + 263856.

It is an arithmetic number, because the mean of its divisors is an integer number (1316202048).

Almost surely, 2^19979314871 is an apocalyptic number.

19979314871 is a deficient number, since it is larger than the sum of its proper divisors (1079917897).

19979314871 is an equidigital number, since it uses as much as digits as its factorization.

19979314871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91822.

The product of its digits is 3429216, while the sum is 59.

The spelling of 19979314871 in words is "nineteen billion, nine hundred seventy-nine million, three hundred fourteen thousand, eight hundred seventy-one".