19979539063 has 4 divisors (see below), whose sum is σ = 21795860808. Its totient is φ = 18163217320.

The previous prime is 19979539061. The next prime is 19979539079. The reversal of 19979539063 is 36093597991.

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

It is a cyclic number.

It is not a de Polignac number, because 19979539063 - 2¹ = 19979539061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19979538992 and 19979539010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19979539061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908160856 + ... + 908160877.

It is an arithmetic number, because the mean of its divisors is an integer number (5448965202).

Almost surely, 2^19979539063 is an apocalyptic number.

19979539063 is a deficient number, since it is larger than the sum of its proper divisors (1816321745).

19979539063 is a wasteful number, since it uses less digits than its factorization.

19979539063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816321744.

The product of its (nonzero) digits is 12400290, while the sum is 61.

The spelling of 19979539063 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, sixty-three".