999999986666667 has 32 divisors (see below), whose sum is σ = 1616077404882432. Its totient is φ = 536937769465344.

The previous prime is 999999986666623. The next prime is 999999986666677. The reversal of 999999986666667 is 766666689999999.

It is not a de Polignac number, because 999999986666667 - 2²² = 999999982472363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999999986666677) 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, 2284544953 + ... + 2284982634.

It is an arithmetic number, because the mean of its divisors is an integer number (50502418902576).

Almost surely, 2^{999999986666667} is an apocalyptic number.

999999986666667 is a deficient number, since it is larger than the sum of its proper divisors (616077418215765).

999999986666667 is a wasteful number, since it uses less digits than its factorization.

999999986666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4569528227.

The product of its digits is 12496635293184, while the sum is 114.

It can be divided in two parts, 99999998 and 6666667, that multiplied together give a palindrome (666666686666666).

The spelling of 999999986666667 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred eighty-six million, six hundred sixty-six thousand, six hundred sixty-seven".