10661865 has 8 divisors (see below), whose sum is σ = 17059008. Its totient is φ = 5686320.

The previous prime is 10661843. The next prime is 10661867. The reversal of 10661865 is 56816601.

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

It is not a de Polignac number, because 10661865 - 2¹⁰ = 10660841 is a prime.

It is a super-2 number, since 2×10661865² = 227350730556450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (10661867) 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, 355381 + ... + 355410.

It is an arithmetic number, because the mean of its divisors is an integer number (2132376).

Almost surely, 2^10661865 is an apocalyptic number.

10661865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10661865 is a deficient number, since it is larger than the sum of its proper divisors (6397143).

10661865 is an equidigital number, since it uses as much as digits as its factorization.

10661865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710799.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 10661865 is about 3265.2511388866. The cubic root of 10661865 is about 220.0954475646.

The spelling of 10661865 in words is "ten million, six hundred sixty-one thousand, eight hundred sixty-five".