999999886641 has 16 divisors (see below), whose sum is σ = 1525234838400. Its totient is φ = 570893948928.

The previous prime is 999999886637. The next prime is 999999886649. The reversal of 999999886641 is 146688999999.

It is not a de Polignac number, because 999999886641 - 2² = 999999886637 is a prime.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999999886649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22250256 + ... + 22295153.

It is an arithmetic number, because the mean of its divisors is an integer number (95327177400).

Almost surely, 2^999999886641 is an apocalyptic number.

It is an amenable number.

999999886641 is a deficient number, since it is larger than the sum of its proper divisors (525234951759).

999999886641 is a wasteful number, since it uses less digits than its factorization.

999999886641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44546488.

The product of its digits is 4897760256, while the sum is 87.

The spelling of 999999886641 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, eight hundred eighty-six thousand, six hundred forty-one".