665030561 has 16 divisors (see below), whose sum is σ = 740160960. Its totient is φ = 593611200.

The previous prime is 665030557. The next prime is 665030593. The reversal of 665030561 is 165030566.

It is not a de Polignac number, because 665030561 - 2² = 665030557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665030501) 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, 50570 + ... + 62348.

It is an arithmetic number, because the mean of its divisors is an integer number (46260060).

Almost surely, 2^665030561 is an apocalyptic number.

It is an amenable number.

665030561 is a deficient number, since it is larger than the sum of its proper divisors (75130399).

665030561 is a wasteful number, since it uses less digits than its factorization.

665030561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11936.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 665030561 is about 25788.1864620217. The cubic root of 665030561 is about 872.8652443544.

The spelling of 665030561 in words is "six hundred sixty-five million, thirty thousand, five hundred sixty-one".