665375013 has 8 divisors (see below), whose sum is σ = 985740800. Its totient is φ = 443583324.

The previous prime is 665374999. The next prime is 665375017. The reversal of 665375013 is 310573566.

It is a happy number.

665375013 is a `hidden beast` number, since 66 + 537 + 50 + 13 = 666.

It is not a de Polignac number, because 665375013 - 2⁸ = 665374757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665375017) 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, 12321733 + ... + 12321786.

It is an arithmetic number, because the mean of its divisors is an integer number (123217600).

Almost surely, 2^665375013 is an apocalyptic number.

It is an amenable number.

665375013 is a deficient number, since it is larger than the sum of its proper divisors (320365787).

665375013 is a wasteful number, since it uses less digits than its factorization.

665375013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24643528 (or 24643522 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 36.

The square root of 665375013 is about 25794.8640818284. The cubic root of 665375013 is about 873.0159182747.

The spelling of 665375013 in words is "six hundred sixty-five million, three hundred seventy-five thousand, thirteen".