999987999899 has 4 divisors (see below), whose sum is σ = 1142843428464. Its totient is φ = 857132571336.

The previous prime is 999987999889. The next prime is 999987999919. The reversal of 999987999899 is 998999789999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999987999899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999987999889) 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, 71427714272 + ... + 71427714285.

It is an arithmetic number, because the mean of its divisors is an integer number (285710857116).

Almost surely, 2^999987999899 is an apocalyptic number.

999987999899 is a deficient number, since it is larger than the sum of its proper divisors (142855428565).

999987999899 is a wasteful number, since it uses less digits than its factorization.

999987999899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142855428564.

The product of its digits is 173564379072, while the sum is 104.

The spelling of 999987999899 in words is "nine hundred ninety-nine billion, nine hundred eighty-seven million, nine hundred ninety-nine thousand, eight hundred ninety-nine".