665168231145 has 16 divisors (see below), whose sum is σ = 1161020912832. Its totient is φ = 322505808960.

The previous prime is 665168231141. The next prime is 665168231159. The reversal of 665168231145 is 541132861566.

It is not a de Polignac number, because 665168231145 - 2² = 665168231141 is a prime.

It is a super-2 number, since 2×665168231145² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665168231094 and 665168231103.

It is not an unprimeable number, because it can be changed into a prime (665168231141) 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, 2015661142 + ... + 2015661471.

It is an arithmetic number, because the mean of its divisors is an integer number (72563807052).

Almost surely, 2^665168231145 is an apocalyptic number.

It is an amenable number.

665168231145 is a deficient number, since it is larger than the sum of its proper divisors (495852681687).

665168231145 is a wasteful number, since it uses less digits than its factorization.

665168231145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4031322632.

The product of its digits is 1036800, while the sum is 48.

The spelling of 665168231145 in words is "six hundred sixty-five billion, one hundred sixty-eight million, two hundred thirty-one thousand, one hundred forty-five".