99320661509 has 4 divisors (see below), whose sum is σ = 99515791020. Its totient is φ = 99125532000.

The previous prime is 99320661497. The next prime is 99320661523. The reversal of 99320661509 is 90516602399.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68760377284 + 30560284225 = 262222^2 + 174815^2 .

It is a cyclic number.

It is not a de Polignac number, because 99320661509 - 2⁴ = 99320661493 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 (99320661589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97563992 + ... + 97565009.

It is an arithmetic number, because the mean of its divisors is an integer number (24878947755).

Almost surely, 2^99320661509 is an apocalyptic number.

It is an amenable number.

99320661509 is a deficient number, since it is larger than the sum of its proper divisors (195129511).

99320661509 is a wasteful number, since it uses less digits than its factorization.

99320661509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195129510.

The product of its (nonzero) digits is 787320, while the sum is 50.

The spelling of 99320661509 in words is "ninety-nine billion, three hundred twenty million, six hundred sixty-one thousand, five hundred nine".