665111042 has 4 divisors (see below), whose sum is σ = 997666566. Its totient is φ = 332555520.

The previous prime is 665111039. The next prime is 665111063. The reversal of 665111042 is 240111566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 564490081 + 100620961 = 23759^2 + 10031^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166277759 + ... + 166277762.

Almost surely, 2^665111042 is an apocalyptic number.

665111042 is a deficient number, since it is larger than the sum of its proper divisors (332555524).

665111042 is a wasteful number, since it uses less digits than its factorization.

665111042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332555523.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 665111042 is about 25789.7468386179. The cubic root of 665111042 is about 872.9004538813.

The spelling of 665111042 in words is "six hundred sixty-five million, one hundred eleven thousand, forty-two".