99135501561 has 24 divisors (see below), whose sum is σ = 148791202560. Its totient is φ = 65960408592.

The previous prime is 99135501557. The next prime is 99135501599. The reversal of 99135501561 is 16510553199.

99135501561 is a `hidden beast` number, since 9 + 9 + 1 + 35 + 50 + 1 + 561 = 666.

It is not a de Polignac number, because 99135501561 - 2² = 99135501557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99135501541) 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 23 ways as a sum of consecutive naturals, for example, 277065 + ... + 524438.

It is an arithmetic number, because the mean of its divisors is an integer number (6199633440).

Almost surely, 2^99135501561 is an apocalyptic number.

It is an amenable number.

99135501561 is a deficient number, since it is larger than the sum of its proper divisors (49655700999).

99135501561 is an equidigital number, since it uses as much as digits as its factorization.

99135501561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802027 (or 802015 counting only the distinct ones).

The product of its (nonzero) digits is 182250, while the sum is 45.

The spelling of 99135501561 in words is "ninety-nine billion, one hundred thirty-five million, five hundred one thousand, five hundred sixty-one".