11666541 has 4 divisors (see below), whose sum is σ = 15555392. Its totient is φ = 7777692.

The previous prime is 11666533. The next prime is 11666549. The reversal of 11666541 is 14566611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14566611 = 3 ⋅4855537.

It is an interprime number because it is at equal distance from previous prime (11666533) and next prime (11666549).

It is not a de Polignac number, because 11666541 - 2³ = 11666533 is a prime.

It is a super-2 number, since 2×11666541² = 272216357809362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11666499 and 11666508.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1944421 + ... + 1944426.

It is an arithmetic number, because the mean of its divisors is an integer number (3888848).

Almost surely, 2^11666541 is an apocalyptic number.

It is an amenable number.

11666541 is a deficient number, since it is larger than the sum of its proper divisors (3888851).

11666541 is an equidigital number, since it uses as much as digits as its factorization.

11666541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888850.

The product of its digits is 4320, while the sum is 30.

The square root of 11666541 is about 3415.6318595540. The cubic root of 11666541 is about 226.8022561978.

The spelling of 11666541 in words is "eleven million, six hundred sixty-six thousand, five hundred forty-one".