665257042 has 32 divisors (see below), whose sum is σ = 1063656000. Its totient is φ = 311508288.

The previous prime is 665257009. The next prime is 665257049. The reversal of 665257042 is 240752566.

It is a junction number, because it is equal to n+sod(n) for n = 665256992 and 665257010.

It is not an unprimeable number, because it can be changed into a prime (665257049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 390709 + ... + 392407.

It is an arithmetic number, because the mean of its divisors is an integer number (33239250).

Almost surely, 2^665257042 is an apocalyptic number.

665257042 is a deficient number, since it is larger than the sum of its proper divisors (398398958).

665257042 is a wasteful number, since it uses less digits than its factorization.

665257042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 665257042 is about 25792.5772655623. The cubic root of 665257042 is about 872.9643199799.

The spelling of 665257042 in words is "six hundred sixty-five million, two hundred fifty-seven thousand, forty-two".