11666642 has 16 divisors (see below), whose sum is σ = 19497240. Its totient is φ = 5198592.

The previous prime is 11666621. The next prime is 11666647. The reversal of 11666642 is 24666611.

It can be written as a sum of positive squares in 4 ways, for example, as 7789681 + 3876961 = 2791^2 + 1969^2 .

It is a super-2 number, since 2×11666642² = 272221071112328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11666599 and 11666608.

It is not an unprimeable number, because it can be changed into a prime (11666647) 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, 6983 + ... + 8490.

Almost surely, 2^11666642 is an apocalyptic number.

11666642 is a deficient number, since it is larger than the sum of its proper divisors (7830598).

11666642 is a wasteful number, since it uses less digits than its factorization.

11666642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15517.

The product of its digits is 10368, while the sum is 32.

The square root of 11666642 is about 3415.6466444877. The cubic root of 11666642 is about 226.8029106895.

The spelling of 11666642 in words is "eleven million, six hundred sixty-six thousand, six hundred forty-two".