99645320161 has 4 divisors (see below), whose sum is σ = 101962653232. Its totient is φ = 97327987092.

The previous prime is 99645320149. The next prime is 99645320197. The reversal of 99645320161 is 16102354699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99645320161 - 2³³ = 91055385569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99645320561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1158666471 + ... + 1158666556.

It is an arithmetic number, because the mean of its divisors is an integer number (25490663308).

Almost surely, 2^99645320161 is an apocalyptic number.

It is an amenable number.

99645320161 is a deficient number, since it is larger than the sum of its proper divisors (2317333071).

99645320161 is a wasteful number, since it uses less digits than its factorization.

99645320161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317333070.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 99645320161 in words is "ninety-nine billion, six hundred forty-five million, three hundred twenty thousand, one hundred sixty-one".