11666789 has 4 divisors (see below), whose sum is σ = 11690220. Its totient is φ = 11643360.

The previous prime is 11666749. The next prime is 11666797. The reversal of 11666789 is 98766611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98766611 = 739 ⋅133649.

It can be written as a sum of positive squares in 2 ways, for example, as 7606564 + 4060225 = 2758^2 + 2015^2 .

It is a cyclic number.

It is not a de Polignac number, because 11666789 - 2⁸ = 11666533 is a prime.

It is a super-2 number, since 2×11666789² = 272227931141042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666749) 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, 10952 + ... + 11969.

It is an arithmetic number, because the mean of its divisors is an integer number (2922555).

Almost surely, 2^11666789 is an apocalyptic number.

It is an amenable number.

11666789 is a deficient number, since it is larger than the sum of its proper divisors (23431).

11666789 is an equidigital number, since it uses as much as digits as its factorization.

11666789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23430.

The product of its digits is 108864, while the sum is 44.

The square root of 11666789 is about 3415.6681630393. The cubic root of 11666789 is about 226.8038632597.

The spelling of 11666789 in words is "eleven million, six hundred sixty-six thousand, seven hundred eighty-nine".