665026242 has 16 divisors (see below), whose sum is σ = 1330305312. Its totient is φ = 221633280.

The previous prime is 665026223. The next prime is 665026253. The reversal of 665026242 is 242620566.

It is an unprimeable number.

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, 55617 + ... + 66507.

It is an arithmetic number, because the mean of its divisors is an integer number (83144082).

Almost surely, 2^665026242 is an apocalyptic number.

665026242 is an abundant number, since it is smaller than the sum of its proper divisors (665279070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665026242 is a wasteful number, since it uses less digits than its factorization.

665026242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21073.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 665026242 is about 25788.1027219918. The cubic root of 665026242 is about 872.8633547605.

The spelling of 665026242 in words is "six hundred sixty-five million, twenty-six thousand, two hundred forty-two".