19979112040 has 24 divisors (see below), whose sum is σ = 44955013590. Its totient is φ = 7991287232.

The previous prime is 19979112007. The next prime is 19979112067. The reversal of 19979112040 is 4021197991.

It can be written as a sum of positive squares in 3 ways, for example, as 8912492836 + 11066619204 = 94406^2 + 105198^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 882786 + ... + 905134.

Almost surely, 2^19979112040 is an apocalyptic number.

19979112040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19979112040 is an abundant number, since it is smaller than the sum of its proper divisors (24975901550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19979112040 is an frugal number, since it uses more digits than its factorization.

19979112040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44709 (or 22356 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 19979112040 in words is "nineteen billion, nine hundred seventy-nine million, one hundred twelve thousand, forty".