99331818561 has 16 divisors (see below), whose sum is σ = 148811716800. Its totient is φ = 65477152224.

The previous prime is 99331818559. The next prime is 99331818577. The reversal of 99331818561 is 16581813399.

99331818561 is a `hidden beast` number, since 9 + 93 + 318 + 185 + 61 = 666.

It is not a de Polignac number, because 99331818561 - 2¹ = 99331818559 is a prime.

It is a super-2 number, since 2×99331818561² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99331818498 and 99331818507.

It is not an unprimeable number, because it can be changed into a prime (99331818581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20665891 + ... + 20670696.

It is an arithmetic number, because the mean of its divisors is an integer number (9300732300).

Almost surely, 2^99331818561 is an apocalyptic number.

It is an amenable number.

99331818561 is a deficient number, since it is larger than the sum of its proper divisors (49479898239).

99331818561 is a wasteful number, since it uses less digits than its factorization.

99331818561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41336685 (or 41336679 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The spelling of 99331818561 in words is "ninety-nine billion, three hundred thirty-one million, eight hundred eighteen thousand, five hundred sixty-one".