665642342 has 8 divisors (see below), whose sum is σ = 1003980432. Its totient is φ = 330982200.

The previous prime is 665642273. The next prime is 665642359. The reversal of 665642342 is 243246566.

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

It is a junction number, because it is equal to n+sod(n) for n = 665642296 and 665642305.

It is a congruent number.

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, 919034 + ... + 919757.

It is an arithmetic number, because the mean of its divisors is an integer number (125497554).

Almost surely, 2^665642342 is an apocalyptic number.

665642342 is a deficient number, since it is larger than the sum of its proper divisors (338338090).

665642342 is a wasteful number, since it uses less digits than its factorization.

665642342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838974.

The product of its digits is 207360, while the sum is 38.

The square root of 665642342 is about 25800.0453875570. The cubic root of 665642342 is about 873.1328203822.

The spelling of 665642342 in words is "six hundred sixty-five million, six hundred forty-two thousand, three hundred forty-two".