999998566681127 has 32 divisors (see below), whose sum is σ = 1134657349425600. Its totient is φ = 873678306152448.

The previous prime is 999998566681069. The next prime is 999998566681223. The reversal of 999998566681127 is 721186665899999.

It is a cyclic number.

It is not a de Polignac number, because 999998566681127 - 2¹⁰ = 999998566680103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999998566681127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998566689127) 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, 11046122999 + ... + 11046213527.

It is an arithmetic number, because the mean of its divisors is an integer number (35458042169550).

Almost surely, 2^{999998566681127} is an apocalyptic number.

999998566681127 is a deficient number, since it is larger than the sum of its proper divisors (134658782744473).

999998566681127 is a wasteful number, since it uses less digits than its factorization.

999998566681127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131715.

The product of its digits is 57140536320, while the sum is 95.

The spelling of 999998566681127 in words is "nine hundred ninety-nine trillion, nine hundred ninety-eight billion, five hundred sixty-six million, six hundred eighty-one thousand, one hundred twenty-seven".