166440229 has 4 divisors (see below), whose sum is σ = 170310976. Its totient is φ = 162569484.

The previous prime is 166440199. The next prime is 166440233. The reversal of 166440229 is 922044661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 922044661 = 137 ⋅6730253.

It is a cyclic number.

It is not a de Polignac number, because 166440229 - 2⁷ = 166440101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166440194 and 166440203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166440289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1935309 + ... + 1935394.

It is an arithmetic number, because the mean of its divisors is an integer number (42577744).

Almost surely, 2^166440229 is an apocalyptic number.

It is an amenable number.

166440229 is a deficient number, since it is larger than the sum of its proper divisors (3870747).

166440229 is an equidigital number, since it uses as much as digits as its factorization.

166440229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3870746.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 166440229 is about 12901.1716134621. The cubic root of 166440229 is about 550.0718682945.

The spelling of 166440229 in words is "one hundred sixty-six million, four hundred forty thousand, two hundred twenty-nine".