999999999999987 has 32 divisors (see below), whose sum is σ = 1533865287989760. Its totient is φ = 567666011842560.

The previous prime is 999999999999947. The next prime is 999999999999989. The reversal of 999999999999987 is 789999999999999.

It is not a de Polignac number, because 999999999999987 - 2²² = 999999995805683 is a prime.

It is a super-9 number, since 9×999999999999987⁹ (a number of 136 digits) contains 999999999 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999999999999989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 171125589 + ... + 176872742.

It is an arithmetic number, because the mean of its divisors is an integer number (47933290249680).

Almost surely, 2^{999999999999987} is an apocalyptic number.

999999999999987 is a deficient number, since it is larger than the sum of its proper divisors (533865287989773).

999999999999987 is a wasteful number, since it uses less digits than its factorization.

999999999999987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347999243.

The product of its digits is 142344486386424, while the sum is 132.

The spelling of 999999999999987 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".