99666605 has 8 divisors (see below), whose sum is σ = 121284864. Its totient is φ = 78610000.

The previous prime is 99666601. The next prime is 99666607. The reversal of 99666605 is 50666699.

It is a happy number.

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

It is not a de Polignac number, because 99666605 - 2² = 99666601 is a prime.

It is a super-3 number, since 3×99666605³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99666605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99666601) 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, 140021 + ... + 140730.

It is an arithmetic number, because the mean of its divisors is an integer number (15160608).

Almost surely, 2^99666605 is an apocalyptic number.

It is an amenable number.

99666605 is a deficient number, since it is larger than the sum of its proper divisors (21618259).

99666605 is a wasteful number, since it uses less digits than its factorization.

99666605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280827.

The product of its (nonzero) digits is 524880, while the sum is 47.

The square root of 99666605 is about 9983.3163327624. The cubic root of 99666605 is about 463.6424815464.

The spelling of 99666605 in words is "ninety-nine million, six hundred sixty-six thousand, six hundred five".