99996661 has 4 divisors (see below), whose sum is σ = 100065132. Its totient is φ = 99928192.

The previous prime is 99996653. The next prime is 99996667. The reversal of 99996661 is 16669999.

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 39250225 + 60746436 = 6265^2 + 7794^2 .

It is a cyclic number.

It is not a de Polignac number, because 99996661 - 2³ = 99996653 is a prime.

It is a super-2 number, since 2×99996661² = 19998664422297842, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99996667) 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, 31996 + ... + 34981.

It is an arithmetic number, because the mean of its divisors is an integer number (25016283).

Almost surely, 2^99996661 is an apocalyptic number.

It is an amenable number.

99996661 is a deficient number, since it is larger than the sum of its proper divisors (68471).

99996661 is a wasteful number, since it uses less digits than its factorization.

99996661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68470.

The product of its digits is 1417176, while the sum is 55.

The square root of 99996661 is about 9999.8330486064. The cubic root of 99996661 is about 464.1537172154.

The spelling of 99996661 in words is "ninety-nine million, nine hundred ninety-six thousand, six hundred sixty-one".