166514581 has 2 divisors, whose sum is σ = 166514582. Its totient is φ = 166514580.

The previous prime is 166514563. The next prime is 166514587. The reversal of 166514581 is 185415661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140043556 + 26471025 = 11834^2 + 5145^2 .

It is a cyclic number.

It is not a de Polignac number, because 166514581 - 2¹⁵ = 166481813 is a prime.

It is a super-2 number, since 2×166514581² = 55454211371211122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166514581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166514587) 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, 83257290 + 83257291.

It is an arithmetic number, because the mean of its divisors is an integer number (83257291).

Almost surely, 2^166514581 is an apocalyptic number.

It is an amenable number.

166514581 is a deficient number, since it is larger than the sum of its proper divisors (1).

166514581 is an equidigital number, since it uses as much as digits as its factorization.

166514581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 37.

The square root of 166514581 is about 12904.0528904682. The cubic root of 166514581 is about 550.1537652718.

The spelling of 166514581 in words is "one hundred sixty-six million, five hundred fourteen thousand, five hundred eighty-one".