99648557509 has 8 divisors (see below), whose sum is σ = 103743706520. Its totient is φ = 95627195136.

The previous prime is 99648557479. The next prime is 99648557527. The reversal of 99648557509 is 90575584699.

It can be written as a sum of positive squares in 4 ways, for example, as 72474024100 + 27174533409 = 269210^2 + 164847^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99648557509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99648557809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18443904 + ... + 18449305.

It is an arithmetic number, because the mean of its divisors is an integer number (12967963315).

Almost surely, 2^99648557509 is an apocalyptic number.

It is an amenable number.

99648557509 is a deficient number, since it is larger than the sum of its proper divisors (4095149011).

99648557509 is a wasteful number, since it uses less digits than its factorization.

99648557509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36893319.

The product of its (nonzero) digits is 122472000, while the sum is 67.

The spelling of 99648557509 in words is "ninety-nine billion, six hundred forty-eight million, five hundred fifty-seven thousand, five hundred nine".