166220023 has 2 divisors, whose sum is σ = 166220024. Its totient is φ = 166220022.

The previous prime is 166220003. The next prime is 166220071. The reversal of 166220023 is 320022661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166220023 - 2¹³ = 166211831 is a prime.

It is a super-2 number, since 2×166220023² = 55258192092241058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166219976 and 166220003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166220003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83110011 + 83110012.

It is an arithmetic number, because the mean of its divisors is an integer number (83110012).

Almost surely, 2^166220023 is an apocalyptic number.

166220023 is a deficient number, since it is larger than the sum of its proper divisors (1).

166220023 is an equidigital number, since it uses as much as digits as its factorization.

166220023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 166220023 is about 12892.6344476216. The cubic root of 166220023 is about 549.8291733941.

Adding to 166220023 its reverse (320022661), we get a palindrome (486242684).

The spelling of 166220023 in words is "one hundred sixty-six million, two hundred twenty thousand, twenty-three".