665331057 has 16 divisors (see below), whose sum is σ = 1043657280. Its totient is φ = 417462336.

The previous prime is 665331049. The next prime is 665331061. The reversal of 665331057 is 750133566.

It is a happy number.

665331057 is a `hidden beast` number, since 66 + 533 + 10 + 57 = 666.

It is not a de Polignac number, because 665331057 - 2³ = 665331049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665331257) 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, 724303 + ... + 725220.

It is an arithmetic number, because the mean of its divisors is an integer number (65228580).

Almost surely, 2^665331057 is an apocalyptic number.

It is an amenable number.

665331057 is a deficient number, since it is larger than the sum of its proper divisors (378326223).

665331057 is a wasteful number, since it uses less digits than its factorization.

665331057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1449549 (or 1449543 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 36.

The square root of 665331057 is about 25794.0120376804. The cubic root of 665331057 is about 872.9966934606.

The spelling of 665331057 in words is "six hundred sixty-five million, three hundred thirty-one thousand, fifty-seven".