99559699664121 has 24 divisors (see below), whose sum is σ = 143905204989000. Its totient is φ = 66328491474432.

The previous prime is 99559699664071. The next prime is 99559699664129. The reversal of 99559699664121 is 12146699695599.

99559699664121 is a `hidden beast` number, since 9 + 9 + 5 + 59 + 6 + 99 + 66 + 412 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 160016000400 + 99399683663721 = 400020^2 + 9969939^2 .

It is not a de Polignac number, because 99559699664121 - 2⁶ = 99559699664057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99559699664129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98355345 + ... + 99362433.

It is an arithmetic number, because the mean of its divisors is an integer number (5996050207875).

Almost surely, 2^{99559699664121} is an apocalyptic number.

It is an amenable number.

99559699664121 is a deficient number, since it is larger than the sum of its proper divisors (44345505324879).

99559699664121 is a wasteful number, since it uses less digits than its factorization.

99559699664121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014473 (or 1014470 counting only the distinct ones).

The product of its digits is 2550916800, while the sum is 81.

The spelling of 99559699664121 in words is "ninety-nine trillion, five hundred fifty-nine billion, six hundred ninety-nine million, six hundred sixty-four thousand, one hundred twenty-one".