11661662189 has 2 divisors, whose sum is σ = 11661662190. Its totient is φ = 11661662188.

The previous prime is 11661662141. The next prime is 11661662209. The reversal of 11661662189 is 98126616611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10162656100 + 1499006089 = 100810^2 + 38717^2 .

It is a cyclic number.

It is not a de Polignac number, because 11661662189 - 2²⁴ = 11644884973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11661665189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5830831094 + 5830831095.

It is an arithmetic number, because the mean of its divisors is an integer number (5830831095).

Almost surely, 2^11661662189 is an apocalyptic number.

It is an amenable number.

11661662189 is a deficient number, since it is larger than the sum of its proper divisors (1).

11661662189 is an equidigital number, since it uses as much as digits as its factorization.

11661662189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 47.

The spelling of 11661662189 in words is "eleven billion, six hundred sixty-one million, six hundred sixty-two thousand, one hundred eighty-nine".