665475423 has 16 divisors (see below), whose sum is σ = 902019456. Its totient is φ = 436312800.

The previous prime is 665475407. The next prime is 665475457. The reversal of 665475423 is 324574566.

It is not a de Polignac number, because 665475423 - 2⁴ = 665475407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665476423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138540 + ... + 143262.

It is an arithmetic number, because the mean of its divisors is an integer number (56376216).

Almost surely, 2^665475423 is an apocalyptic number.

665475423 is a deficient number, since it is larger than the sum of its proper divisors (236544033).

665475423 is a wasteful number, since it uses less digits than its factorization.

665475423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494.

The product of its digits is 604800, while the sum is 42.

The square root of 665475423 is about 25796.8103260849. The cubic root of 665475423 is about 873.0598309142.

The spelling of 665475423 in words is "six hundred sixty-five million, four hundred seventy-five thousand, four hundred twenty-three".