99169561261 has 4 divisors (see below), whose sum is σ = 99170577724. Its totient is φ = 99168544800.

The previous prime is 99169561201. The next prime is 99169561273. The reversal of 99169561261 is 16216596199.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 62255240100 + 36914321161 = 249510^2 + 192131^2 .

It is a cyclic number.

It is not a de Polignac number, because 99169561261 - 2²⁹ = 98632690349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99169561201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344250 + ... + 562891.

It is an arithmetic number, because the mean of its divisors is an integer number (24792644431).

Almost surely, 2^99169561261 is an apocalyptic number.

It is an amenable number.

99169561261 is a deficient number, since it is larger than the sum of its proper divisors (1016463).

99169561261 is a wasteful number, since it uses less digits than its factorization.

99169561261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016462.

The product of its digits is 1574640, while the sum is 55.

The spelling of 99169561261 in words is "ninety-nine billion, one hundred sixty-nine million, five hundred sixty-one thousand, two hundred sixty-one".