665382785642 has 8 divisors (see below), whose sum is σ = 998078436000. Its totient is φ = 332689973644.

The previous prime is 665382785629. The next prime is 665382785663. The reversal of 665382785642 is 246587283566.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31109 + ... + 1154007.

It is an arithmetic number, because the mean of its divisors is an integer number (124759804500).

Almost surely, 2^665382785642 is an apocalyptic number.

665382785642 is a deficient number, since it is larger than the sum of its proper divisors (332695650358).

665382785642 is a wasteful number, since it uses less digits than its factorization.

665382785642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419180.

The product of its digits is 116121600, while the sum is 62.

The spelling of 665382785642 in words is "six hundred sixty-five billion, three hundred eighty-two million, seven hundred eighty-five thousand, six hundred forty-two".