11666667889 has 4 divisors (see below), whose sum is σ = 11667908160. Its totient is φ = 11665427620.

The previous prime is 11666667827. The next prime is 11666667899. The reversal of 11666667889 is 98876666611.

It is a happy number.

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: 98876666611 = 103 ⋅959967637.

It is a cyclic number.

It is not a de Polignac number, because 11666667889 - 2²¹ = 11664570737 is a prime.

It is a super-2 number, since 2×11666667889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 11666667889.

It is not an unprimeable number, because it can be changed into a prime (11666667899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605917 + ... + 624874.

It is an arithmetic number, because the mean of its divisors is an integer number (2916977040).

Almost surely, 2^11666667889 is an apocalyptic number.

It is an amenable number.

11666667889 is a deficient number, since it is larger than the sum of its proper divisors (1240271).

11666667889 is an equidigital number, since it uses as much as digits as its factorization.

11666667889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240270.

The product of its digits is 31352832, while the sum is 64.

The spelling of 11666667889 in words is "eleven billion, six hundred sixty-six million, six hundred sixty-seven thousand, eight hundred eighty-nine".