665415423 has 12 divisors (see below), whose sum is σ = 961730328. Its totient is φ = 443345040.

The previous prime is 665415419. The next prime is 665415427. The reversal of 665415423 is 324514566.

665415423 is a `hidden beast` number, since 66 + 54 + 1 + 542 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (665415419) and next prime (665415427).

It is not a de Polignac number, because 665415423 - 2² = 665415419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665415427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5565 + ... + 36902.

It is an arithmetic number, because the mean of its divisors is an integer number (80144194).

Almost surely, 2^665415423 is an apocalyptic number.

665415423 is a deficient number, since it is larger than the sum of its proper divisors (296314905).

665415423 is a wasteful number, since it uses less digits than its factorization.

665415423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44214 (or 44211 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 665415423 is about 25795.6473653987. The cubic root of 665415423 is about 873.0335914457.

Adding to 665415423 its reverse (324514566), we get a palindrome (989929989).

The spelling of 665415423 in words is "six hundred sixty-five million, four hundred fifteen thousand, four hundred twenty-three".