665369866 has 8 divisors (see below), whose sum is σ = 1140634080. Its totient is φ = 285158508.

The previous prime is 665369863. The next prime is 665369867. The reversal of 665369866 is 668963566.

665369866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 (665369863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23763196 + ... + 23763223.

It is an arithmetic number, because the mean of its divisors is an integer number (142579260).

Almost surely, 2^665369866 is an apocalyptic number.

665369866 is a deficient number, since it is larger than the sum of its proper divisors (475264214).

665369866 is a wasteful number, since it uses less digits than its factorization.

665369866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47526428.

The product of its digits is 8398080, while the sum is 55.

The square root of 665369866 is about 25794.7643137130. The cubic root of 665369866 is about 873.0136672010.

The spelling of 665369866 in words is "six hundred sixty-five million, three hundred sixty-nine thousand, eight hundred sixty-six".