423566165 has 16 divisors (see below), whose sum is σ = 555145920. Its totient is φ = 307681920.

The previous prime is 423566159. The next prime is 423566167. The reversal of 423566165 is 561665324.

It is a happy number.

It is not a de Polignac number, because 423566165 - 2²⁶ = 356457301 is a prime.

It is a super-2 number, since 2×423566165² = 358816592265614450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423566167) 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 in 15 ways as a sum of consecutive naturals, for example, 47426 + ... + 55644.

It is an arithmetic number, because the mean of its divisors is an integer number (34696620).

Almost surely, 2^423566165 is an apocalyptic number.

It is an amenable number.

423566165 is a deficient number, since it is larger than the sum of its proper divisors (131579755).

423566165 is a wasteful number, since it uses less digits than its factorization.

423566165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9172.

The product of its digits is 129600, while the sum is 38.

The square root of 423566165 is about 20580.7231408423. The cubic root of 423566165 is about 751.0008356950. Note that the first 3 decimals are identical.

The spelling of 423566165 in words is "four hundred twenty-three million, five hundred sixty-six thousand, one hundred sixty-five".