665406842 has 8 divisors (see below), whose sum is σ = 998244000. Its totient is φ = 332658844.

The previous prime is 665406829. The next prime is 665406869. The reversal of 665406842 is 248604566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 665406842.

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 3 ways as a sum of consecutive naturals, for example, 1409 + ... + 36507.

It is an arithmetic number, because the mean of its divisors is an integer number (124780500).

Almost surely, 2^665406842 is an apocalyptic number.

665406842 is a deficient number, since it is larger than the sum of its proper divisors (332837158).

665406842 is a wasteful number, since it uses less digits than its factorization.

665406842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44580.

The product of its (nonzero) digits is 276480, while the sum is 41.

The square root of 665406842 is about 25795.4810383524. The cubic root of 665406842 is about 873.0298386354.

The spelling of 665406842 in words is "six hundred sixty-five million, four hundred six thousand, eight hundred forty-two".