166555369 has 2 divisors, whose sum is σ = 166555370. Its totient is φ = 166555368.

The previous prime is 166555331. The next prime is 166555393. The reversal of 166555369 is 963555661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165894400 + 660969 = 12880^2 + 813^2 .

It is a cyclic number.

It is not a de Polignac number, because 166555369 - 2²³ = 158166761 is a prime.

It is a super-2 number, since 2×166555369² = 55481381885452322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166505369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83277684 + 83277685.

It is an arithmetic number, because the mean of its divisors is an integer number (83277685).

Almost surely, 2^166555369 is an apocalyptic number.

It is an amenable number.

166555369 is a deficient number, since it is larger than the sum of its proper divisors (1).

166555369 is an equidigital number, since it uses as much as digits as its factorization.

166555369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 729000, while the sum is 46.

The square root of 166555369 is about 12905.6332273934. The cubic root of 166555369 is about 550.1986819385.

The spelling of 166555369 in words is "one hundred sixty-six million, five hundred fifty-five thousand, three hundred sixty-nine".