19881846009 has 15 divisors (see below), whose sum is σ = 29701937397. Its totient is φ = 13253717988.

The previous prime is 19881846007. The next prime is 19881846037. The reversal of 19881846009 is 90064818891.

The square root of 19881846009 is 141003.

It is a perfect power (a square), and thus also a powerful number.

19881846009 is a `hidden beast` number, since 19 + 8 + 8 + 18 + 4 + 600 + 9 = 666.

It is not a de Polignac number, because 19881846009 - 2¹ = 19881846007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19881846007) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1261194 + ... + 1276860.

Almost surely, 2^19881846009 is an apocalyptic number.

19881846009 is the 141003-rd square number.

19881846009 is the 70502-nd centered octagonal number.

It is an amenable number.

19881846009 is a deficient number, since it is larger than the sum of its proper divisors (9820091388).

19881846009 is an frugal number, since it uses more digits than its factorization.

19881846009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31346 (or 15670 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The spelling of 19881846009 in words is "nineteen billion, eight hundred eighty-one million, eight hundred forty-six thousand, nine".