166513111 has 2 divisors, whose sum is σ = 166513112. Its totient is φ = 166513110.

The previous prime is 166513063. The next prime is 166513117. The reversal of 166513111 is 111315661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166513111 - 2¹⁵ = 166480343 is a prime.

It is a super-2 number, since 2×166513111² = 55453232269796642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166513117) 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, 83256555 + 83256556.

It is an arithmetic number, because the mean of its divisors is an integer number (83256556).

Almost surely, 2^166513111 is an apocalyptic number.

166513111 is a deficient number, since it is larger than the sum of its proper divisors (1).

166513111 is an equidigital number, since it uses as much as digits as its factorization.

166513111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 25.

The square root of 166513111 is about 12903.9959314935. The cubic root of 166513111 is about 550.1521463377.

Adding to 166513111 its reverse (111315661), we get a palindrome (277828772).

The spelling of 166513111 in words is "one hundred sixty-six million, five hundred thirteen thousand, one hundred eleven".