19979539079 has 2 divisors, whose sum is σ = 19979539080. Its totient is φ = 19979539078.

The previous prime is 19979539061. The next prime is 19979539081. The reversal of 19979539079 is 97093597991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19979539079 - 2²⁸ = 19711103623 is a prime.

Together with 19979539081, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19979530079) 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 as a sum of consecutive naturals, namely, 9989769539 + 9989769540.

It is an arithmetic number, because the mean of its divisors is an integer number (9989769540).

Almost surely, 2^19979539079 is an apocalyptic number.

19979539079 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979539079 is an equidigital number, since it uses as much as digits as its factorization.

19979539079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43401015, while the sum is 68.

The spelling of 19979539079 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, seventy-nine".