100665665 has 8 divisors (see below), whose sum is σ = 120852648. Its totient is φ = 80496640.

The previous prime is 100665659. The next prime is 100665679. The reversal of 100665665 is 566566001.

It can be written as a sum of positive squares in 4 ways, for example, as 55413136 + 45252529 = 7444^2 + 6727^2 .

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

It is not a de Polignac number, because 100665665 - 2⁶ = 100665601 is a prime.

It is a super-2 number, since 2×100665665² = 20267152219784450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20159 + ... + 24651.

It is an arithmetic number, because the mean of its divisors is an integer number (15106581).

Almost surely, 2^100665665 is an apocalyptic number.

It is an amenable number.

100665665 is a deficient number, since it is larger than the sum of its proper divisors (20186983).

100665665 is an equidigital number, since it uses as much as digits as its factorization.

100665665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8979.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 100665665 is about 10033.2280448518. The cubic root of 100665665 is about 465.1865209256.

The spelling of 100665665 in words is "one hundred million, six hundred sixty-five thousand, six hundred sixty-five".