665200065423 has 8 divisors (see below), whose sum is σ = 891833605936. Its totient is φ = 441016617600.

The previous prime is 665200065419. The next prime is 665200065433. The reversal of 665200065423 is 324560002566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665200065423 - 2² = 665200065419 is a prime.

It is a super-2 number, since 2×665200065423² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665200065403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612522538 + ... + 612523623.

It is an arithmetic number, because the mean of its divisors is an integer number (111479200742).

Almost surely, 2^665200065423 is an apocalyptic number.

665200065423 is a deficient number, since it is larger than the sum of its proper divisors (226633540513).

665200065423 is a wasteful number, since it uses less digits than its factorization.

665200065423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225046345.

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 665200065423 its reverse (324560002566), we get a palindrome (989760067989).

The spelling of 665200065423 in words is "six hundred sixty-five billion, two hundred million, sixty-five thousand, four hundred twenty-three".