11666540 has 36 divisors (see below), whose sum is σ = 25357248. Its totient is φ = 4508640.

The previous prime is 11666533. The next prime is 11666549. The reversal of 11666540 is 4566611.

It is a super-2 number, since 2×11666540² = 272216311143200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11666549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18917 + ... + 19523.

It is an arithmetic number, because the mean of its divisors is an integer number (704368).

Almost surely, 2^11666540 is an apocalyptic number.

11666540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11666540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12678624).

11666540 is an abundant number, since it is smaller than the sum of its proper divisors (13690708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11666540 is a wasteful number, since it uses less digits than its factorization.

11666540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 11666540 is about 3415.6317131682. The cubic root of 11666540 is about 226.8022497177.

The spelling of 11666540 in words is "eleven million, six hundred sixty-six thousand, five hundred forty".