665605017 has 48 divisors (see below), whose sum is σ = 1261777920. Its totient is φ = 327564000.

The previous prime is 665604967. The next prime is 665605033. The reversal of 665605017 is 710506566.

It is a happy number.

It is not a de Polignac number, because 665605017 - 2¹¹ = 665602969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665605037) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12109 + ... + 38442.

It is an arithmetic number, because the mean of its divisors is an integer number (26287040).

Almost surely, 2^665605017 is an apocalyptic number.

It is an amenable number.

665605017 is a deficient number, since it is larger than the sum of its proper divisors (596172903).

665605017 is a wasteful number, since it uses less digits than its factorization.

665605017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50594 (or 50591 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 665605017 is about 25799.3220259758. The cubic root of 665605017 is about 873.1165001606.

The spelling of 665605017 in words is "six hundred sixty-five million, six hundred five thousand, seventeen".