166311023 has 2 divisors, whose sum is σ = 166311024. Its totient is φ = 166311022.

The previous prime is 166310981. The next prime is 166311049. The reversal of 166311023 is 320113661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166311023 - 2¹⁰ = 166309999 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166311023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166311053) 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, 83155511 + 83155512.

It is an arithmetic number, because the mean of its divisors is an integer number (83155512).

Almost surely, 2^166311023 is an apocalyptic number.

166311023 is a deficient number, since it is larger than the sum of its proper divisors (1).

166311023 is an equidigital number, since it uses as much as digits as its factorization.

166311023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 166311023 is about 12896.1631115615. The cubic root of 166311023 is about 549.9294928901.

Adding to 166311023 its reverse (320113661), we get a palindrome (486424684).

The spelling of 166311023 in words is "one hundred sixty-six million, three hundred eleven thousand, twenty-three".