155666011169 has 2 divisors, whose sum is σ = 155666011170. Its totient is φ = 155666011168.

The previous prime is 155666011159. The next prime is 155666011211. The reversal of 155666011169 is 961110666551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100956801169 + 54709210000 = 317737^2 + 233900^2 .

It is a cyclic number.

It is not a de Polignac number, because 155666011169 - 2²⁴ = 155649233953 is a prime.

It is a super-2 number, since 2×155666011169² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155666011159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77833005584 + 77833005585.

It is an arithmetic number, because the mean of its divisors is an integer number (77833005585).

Almost surely, 2^155666011169 is an apocalyptic number.

It is an amenable number.

155666011169 is a deficient number, since it is larger than the sum of its proper divisors (1).

155666011169 is an equidigital number, since it uses as much as digits as its factorization.

155666011169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 155666011169 in words is "one hundred fifty-five billion, six hundred sixty-six million, eleven thousand, one hundred sixty-nine".