665106057 has 72 divisors (see below), whose sum is σ = 1227949632. Its totient is φ = 343022400.

The previous prime is 665106041. The next prime is 665106067. The reversal of 665106057 is 750601566.

It is a happy number.

665106057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665106057 - 2⁴ = 665106041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665106007) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 809707 + ... + 810527.

It is an arithmetic number, because the mean of its divisors is an integer number (17054856).

Almost surely, 2^665106057 is an apocalyptic number.

It is an amenable number.

665106057 is a deficient number, since it is larger than the sum of its proper divisors (562843575).

665106057 is a wasteful number, since it uses less digits than its factorization.

665106057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019 (or 1009 counting only the distinct ones).

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

The square root of 665106057 is about 25789.6501915012. The cubic root of 665106057 is about 872.8982730827.

The spelling of 665106057 in words is "six hundred sixty-five million, one hundred six thousand, fifty-seven".