10666665 has 24 divisors (see below), whose sum is σ = 18574920. Its totient is φ = 5662464.

The previous prime is 10666609. The next prime is 10666673. The reversal of 10666665 is 56666601.

It can be written as a sum of positive squares in 4 ways, for example, as 5631129 + 5035536 = 2373^2 + 2244^2 .

It is not a de Polignac number, because 10666665 - 2⁹ = 10666153 is a prime.

It is a super-2 number, since 2×10666665² = 227555484444450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12781 + ... + 13589.

It is an arithmetic number, because the mean of its divisors is an integer number (773955).

Almost surely, 2^10666665 is an apocalyptic number.

10666665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10666665 is a deficient number, since it is larger than the sum of its proper divisors (7908255).

10666665 is a wasteful number, since it uses less digits than its factorization.

10666665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1113 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 10666665 is about 3265.9860685557. The cubic root of 10666665 is about 220.1284717946.

The spelling of 10666665 in words is "ten million, six hundred sixty-six thousand, six hundred sixty-five".