19979539042 has 16 divisors (see below), whose sum is σ = 30098509272. Its totient is φ = 9946782720.

The previous prime is 19979539001. The next prime is 19979539043. The reversal of 19979539042 is 24093597991.

It can be written as a sum of positive squares in 4 ways, for example, as 14563903761 + 5415635281 = 120681^2 + 73591^2 .

It is not an unprimeable number, because it can be changed into a prime (19979539043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493438 + ... + 532390.

Almost surely, 2^19979539042 is an apocalyptic number.

19979539042 is a deficient number, since it is larger than the sum of its proper divisors (10118970230).

19979539042 is a wasteful number, since it uses less digits than its factorization.

19979539042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40053.

The product of its (nonzero) digits is 5511240, while the sum is 58.

The spelling of 19979539042 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, forty-two".