9981661899 has 8 divisors (see below), whose sum is σ = 14518780992. Its totient is φ = 6049492040.

The previous prime is 9981661817. The next prime is 9981661919.

9981661899 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9981661899 - 2³³ = 1391727307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9981665899) 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, 151237269 + ... + 151237334.

It is an arithmetic number, because the mean of its divisors is an integer number (1814847624).

Almost surely, 2^9981661899 is an apocalyptic number.

9981661899 is a deficient number, since it is larger than the sum of its proper divisors (4537119093).

9981661899 is a wasteful number, since it uses less digits than its factorization.

9981661899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302474617.

The product of its digits is 15116544, while the sum is 66.

The square root of 9981661899 is about 99908.2674206694. The cubic root of 9981661899 is about 2153.1169428392.

The spelling of 9981661899 in words is "nine billion, nine hundred eighty-one million, six hundred sixty-one thousand, eight hundred ninety-nine".