19979539005 has 16 divisors (see below), whose sum is σ = 31989761280. Its totient is φ = 10648254528.

The previous prime is 19979539001. The next prime is 19979539043. The reversal of 19979539005 is 50093597991.

It is not a de Polignac number, because 19979539005 - 2² = 19979539001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19979539001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446670 + ... + 489359.

It is an arithmetic number, because the mean of its divisors is an integer number (1999360080).

Almost surely, 2^19979539005 is an apocalyptic number.

19979539005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19979539005 is a deficient number, since it is larger than the sum of its proper divisors (12010222275).

19979539005 is a wasteful number, since it uses less digits than its factorization.

19979539005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937460.

The product of its (nonzero) digits is 3444525, while the sum is 57.

The spelling of 19979539005 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, five".