665612057 has 4 divisors (see below), whose sum is σ = 726122256. Its totient is φ = 605101860.

The previous prime is 665612039. The next prime is 665612063. The reversal of 665612057 is 750216566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 665612057 - 2⁸ = 665611801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665612057.

It is not an unprimeable number, because it can be changed into a prime (665612957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30255083 + ... + 30255104.

It is an arithmetic number, because the mean of its divisors is an integer number (181530564).

Almost surely, 2^665612057 is an apocalyptic number.

It is an amenable number.

665612057 is a deficient number, since it is larger than the sum of its proper divisors (60510199).

665612057 is a wasteful number, since it uses less digits than its factorization.

665612057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60510198.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 665612057 is about 25799.4584633089. The cubic root of 665612057 is about 873.1195784219.

The spelling of 665612057 in words is "six hundred sixty-five million, six hundred twelve thousand, fifty-seven".