99111188552081 has 16 divisors (see below), whose sum is σ = 100916718239568. Its totient is φ = 97311532032000.

The previous prime is 99111188552063. The next prime is 99111188552107. The reversal of 99111188552081 is 18025588111199.

It can be written as a sum of positive squares in 8 ways, for example, as 36548783622481 + 62562404929600 = 6045559^2 + 7909640^2 .

It is a cyclic number.

It is not a de Polignac number, because 99111188552081 - 2³⁴ = 99094008682897 is a prime.

It is a super-2 number, since 2×99111188552081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99111188552081.

It is not an unprimeable number, because it can be changed into a prime (99111188552581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287726705 + ... + 288070961.

It is an arithmetic number, because the mean of its divisors is an integer number (6307294889973).

Almost surely, 2^{99111188552081} is an apocalyptic number.

It is an amenable number.

99111188552081 is a deficient number, since it is larger than the sum of its proper divisors (1805529687487).

99111188552081 is a wasteful number, since it uses less digits than its factorization.

99111188552081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352772.

The product of its (nonzero) digits is 2073600, while the sum is 59.

The spelling of 99111188552081 in words is "ninety-nine trillion, one hundred eleven billion, one hundred eighty-eight million, five hundred fifty-two thousand, eighty-one".