166888831 has 2 divisors, whose sum is σ = 166888832. Its totient is φ = 166888830.

The previous prime is 166888829. The next prime is 166888849. The reversal of 166888831 is 138888661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166888831 - 2¹ = 166888829 is a prime.

It is a super-2 number, since 2×166888831² = 55703763825093122, which contains 22 as substring.

Together with 166888829, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166888801) 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, 83444415 + 83444416.

It is an arithmetic number, because the mean of its divisors is an integer number (83444416).

Almost surely, 2^166888831 is an apocalyptic number.

166888831 is a deficient number, since it is larger than the sum of its proper divisors (1).

166888831 is an equidigital number, since it uses as much as digits as its factorization.

166888831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442368, while the sum is 49.

The square root of 166888831 is about 12918.5460095167. The cubic root of 166888831 is about 550.5656230694.

The spelling of 166888831 in words is "one hundred sixty-six million, eight hundred eighty-eight thousand, eight hundred thirty-one".