665265141 has 6 divisors (see below), whose sum is σ = 960938550. Its totient is φ = 443510088.

The previous prime is 665265137. The next prime is 665265157. The reversal of 665265141 is 141562566.

It can be written as a sum of positive squares in only one way, i.e., 647498916 + 17766225 = 25446^2 + 4215^2 .

It is not a de Polignac number, because 665265141 - 2² = 665265137 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665265096 and 665265105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665265841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36959166 + ... + 36959183.

It is an arithmetic number, because the mean of its divisors is an integer number (160156425).

Almost surely, 2^665265141 is an apocalyptic number.

It is an amenable number.

665265141 is a deficient number, since it is larger than the sum of its proper divisors (295673409).

665265141 is a wasteful number, since it uses less digits than its factorization.

665265141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73918355 (or 73918352 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 665265141 is about 25792.7342676189. The cubic root of 665265141 is about 872.9678625251.

The spelling of 665265141 in words is "six hundred sixty-five million, two hundred sixty-five thousand, one hundred forty-one".