99955661 has 8 divisors (see below), whose sum is σ = 107841720. Its totient is φ = 92097792.

The previous prime is 99955651. The next prime is 99955673. The reversal of 99955661 is 16655999.

99955661 = 7069² + 7070².

It can be written as a sum of positive squares in 4 ways, for example, as 75625 + 99880036 = 275^2 + 9994^2 .

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 99955661 - 2¹⁰ = 99954637 is a prime.

It is a super-2 number, since 2×99955661² = 19982268331893842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99955601) 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, 641 + ... + 14153.

It is an arithmetic number, because the mean of its divisors is an integer number (13480215).

Almost surely, 2^99955661 is an apocalyptic number.

99955661 is the 7070-th centered square number.

It is an amenable number.

99955661 is a deficient number, since it is larger than the sum of its proper divisors (7886059).

99955661 is a wasteful number, since it uses less digits than its factorization.

99955661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14095.

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

The square root of 99955661 is about 9997.7828042021. The cubic root of 99955661 is about 464.0902720840.

The spelling of 99955661 in words is "ninety-nine million, nine hundred fifty-five thousand, six hundred sixty-one".