665116057 has 8 divisors (see below), whose sum is σ = 668404296. Its totient is φ = 661834752.

The previous prime is 665116051. The next prime is 665116061. The reversal of 665116057 is 750611566.

It can be written as a sum of positive squares in 4 ways, for example, as 301401 + 664814656 = 549^2 + 25784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665116057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665116051) 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 7 ways as a sum of consecutive naturals, for example, 336123 + ... + 338095.

It is an arithmetic number, because the mean of its divisors is an integer number (83550537).

Almost surely, 2^665116057 is an apocalyptic number.

It is an amenable number.

665116057 is a deficient number, since it is larger than the sum of its proper divisors (3288239).

665116057 is a wasteful number, since it uses less digits than its factorization.

665116057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 665116057 is about 25789.8440669966. The cubic root of 665116057 is about 872.9026477930.

The spelling of 665116057 in words is "six hundred sixty-five million, one hundred sixteen thousand, fifty-seven".