423903534165 has 80 divisors (see below), whose sum is σ = 773348471280. Its totient is φ = 222086292480.

The previous prime is 423903534161. The next prime is 423903534167. The reversal of 423903534165 is 561435309324.

423903534165 is a `hidden beast` number, since 4 + 23 + 90 + 3 + 534 + 1 + 6 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 121325429124 + 302578105041 = 348318^2 + 550071^2 .

It is not a de Polignac number, because 423903534165 - 2² = 423903534161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 423903534165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423903534161) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 19679121 + ... + 19700649.

It is an arithmetic number, because the mean of its divisors is an integer number (9666855891).

Almost surely, 2^423903534165 is an apocalyptic number.

423903534165 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

423903534165 is a deficient number, since it is larger than the sum of its proper divisors (349444937115).

423903534165 is a wasteful number, since it uses less digits than its factorization.

423903534165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22404 (or 22395 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 423903534165 in words is "four hundred twenty-three billion, nine hundred three million, five hundred thirty-four thousand, one hundred sixty-five".