166136573 has 2 divisors, whose sum is σ = 166136574. Its totient is φ = 166136572.

The previous prime is 166136557. The next prime is 166136603. The reversal of 166136573 is 375631661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161239204 + 4897369 = 12698^2 + 2213^2 .

It is a cyclic number.

It is not a de Polignac number, because 166136573 - 2⁴ = 166136557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166132573) 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, 83068286 + 83068287.

It is an arithmetic number, because the mean of its divisors is an integer number (83068287).

Almost surely, 2^166136573 is an apocalyptic number.

It is an amenable number.

166136573 is a deficient number, since it is larger than the sum of its proper divisors (1).

166136573 is an equidigital number, since it uses as much as digits as its factorization.

166136573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

The square root of 166136573 is about 12889.3976973325. The cubic root of 166136573 is about 549.7371449202.

It can be divided in two parts, 1661 and 36573, that multiplied together give a triangular number (60747753 = T₁₁₀₂₂).

The spelling of 166136573 in words is "one hundred sixty-six million, one hundred thirty-six thousand, five hundred seventy-three".