665894232895 has 4 divisors (see below), whose sum is σ = 799073079480. Its totient is φ = 532715386312.

The previous prime is 665894232863. The next prime is 665894232919. The reversal of 665894232895 is 598232498566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665894232895 - 2⁵ = 665894232863 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 665894232895.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66589423285 + ... + 66589423294.

It is an arithmetic number, because the mean of its divisors is an integer number (199768269870).

Almost surely, 2^665894232895 is an apocalyptic number.

665894232895 is a deficient number, since it is larger than the sum of its proper divisors (133178846585).

665894232895 is a wasteful number, since it uses less digits than its factorization.

665894232895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133178846584.

The product of its digits is 223948800, while the sum is 67.

The spelling of 665894232895 in words is "six hundred sixty-five billion, eight hundred ninety-four million, two hundred thirty-two thousand, eight hundred ninety-five".