665916995 has 8 divisors (see below), whose sum is σ = 826655760. Its totient is φ = 514363360.

The previous prime is 665916989. The next prime is 665917019. The reversal of 665916995 is 599619566.

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

It is not a de Polignac number, because 665916995 - 2¹⁸ = 665654851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665916995.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2296121 + ... + 2296410.

It is an arithmetic number, because the mean of its divisors is an integer number (103331970).

Almost surely, 2^665916995 is an apocalyptic number.

665916995 is a deficient number, since it is larger than the sum of its proper divisors (160738765).

665916995 is a wasteful number, since it uses less digits than its factorization.

665916995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4592565.

The product of its digits is 3936600, while the sum is 56.

The square root of 665916995 is about 25805.3675618078. The cubic root of 665916995 is about 873.2528926584.

The spelling of 665916995 in words is "six hundred sixty-five million, nine hundred sixteen thousand, nine hundred ninety-five".