19921976679 has 16 divisors (see below), whose sum is σ = 29912177664. Its totient is φ = 11684443200.

The previous prime is 19921976663. The next prime is 19921976687. The reversal of 19921976679 is 97667912991.

It is not a de Polignac number, because 19921976679 - 2⁴ = 19921976663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19921976279) 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, 9736014 + ... + 9738059.

It is an arithmetic number, because the mean of its divisors is an integer number (1869511104).

Almost surely, 2^19921976679 is an apocalyptic number.

19921976679 is a deficient number, since it is larger than the sum of its proper divisors (9990200985).

19921976679 is a wasteful number, since it uses less digits than its factorization.

19921976679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19474118.

The product of its digits is 23147208, while the sum is 66.

The spelling of 19921976679 in words is "nineteen billion, nine hundred twenty-one million, nine hundred seventy-six thousand, six hundred seventy-nine".