99956561 has 8 divisors (see below), whose sum is σ = 101824800. Its totient is φ = 98094240.

The previous prime is 99956557. The next prime is 99956581. The reversal of 99956561 is 16565999.

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

It is a cyclic number.

It is not a de Polignac number, because 99956561 - 2² = 99956557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99956581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46805 + ... + 48893.

It is an arithmetic number, because the mean of its divisors is an integer number (12728100).

Almost surely, 2^99956561 is an apocalyptic number.

It is an amenable number.

99956561 is a deficient number, since it is larger than the sum of its proper divisors (1868239).

99956561 is a wasteful number, since it uses less digits than its factorization.

99956561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959.

The product of its digits is 656100, while the sum is 50.

The square root of 99956561 is about 9997.8278140804. The cubic root of 99956561 is about 464.0916649682.

The spelling of 99956561 in words is "ninety-nine million, nine hundred fifty-six thousand, five hundred sixty-one".