665116658 has 8 divisors (see below), whose sum is σ = 998645760. Its totient is φ = 332234740.

The previous prime is 665116657. The next prime is 665116667. The reversal of 665116658 is 856611566.

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

It is not an unprimeable number, because it can be changed into a prime (665116657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159218 + ... + 163341.

It is an arithmetic number, because the mean of its divisors is an integer number (124830720).

Almost surely, 2^665116658 is an apocalyptic number.

665116658 is a deficient number, since it is larger than the sum of its proper divisors (333529102).

665116658 is a wasteful number, since it uses less digits than its factorization.

665116658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323592.

The product of its digits is 259200, while the sum is 44.

The square root of 665116658 is about 25789.8557188674. The cubic root of 665116658 is about 872.9029107117.

The spelling of 665116658 in words is "six hundred sixty-five million, one hundred sixteen thousand, six hundred fifty-eight".