665729863 has 8 divisors (see below), whose sum is σ = 695313360. Its totient is φ = 636756480.

The previous prime is 665729861. The next prime is 665729921. The reversal of 665729863 is 368927566.

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

It is a cyclic number.

It is not a de Polignac number, because 665729863 - 2¹ = 665729861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665729863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665729861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150298 + ... + 154663.

It is an arithmetic number, because the mean of its divisors is an integer number (86914170).

Almost surely, 2^665729863 is an apocalyptic number.

665729863 is a deficient number, since it is larger than the sum of its proper divisors (29583497).

665729863 is a wasteful number, since it uses less digits than its factorization.

665729863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305057.

The product of its digits is 3265920, while the sum is 52.

The square root of 665729863 is about 25801.7414722340. The cubic root of 665729863 is about 873.1710862315.

The spelling of 665729863 in words is "six hundred sixty-five million, seven hundred twenty-nine thousand, eight hundred sixty-three".