19479589679 has 4 divisors (see below), whose sum is σ = 21250461480. Its totient is φ = 17708717880.

The previous prime is 19479589669. The next prime is 19479589729. The reversal of 19479589679 is 97698597491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19479589679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19479589609) 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, 885435884 + ... + 885435905.

It is an arithmetic number, because the mean of its divisors is an integer number (5312615370).

Almost surely, 2^19479589679 is an apocalyptic number.

19479589679 is a deficient number, since it is larger than the sum of its proper divisors (1770871801).

19479589679 is a wasteful number, since it uses less digits than its factorization.

19479589679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770871800.

The product of its digits is 308629440, while the sum is 74.

The spelling of 19479589679 in words is "nineteen billion, four hundred seventy-nine million, five hundred eighty-nine thousand, six hundred seventy-nine".