665395678 has 8 divisors (see below), whose sum is σ = 1003265568. Its totient is φ = 330973824.

The previous prime is 665395669. The next prime is 665395699. The reversal of 665395678 is 876593566.

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

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, 861526 + ... + 862297.

It is an arithmetic number, because the mean of its divisors is an integer number (125408196).

Almost surely, 2^665395678 is an apocalyptic number.

665395678 is a deficient number, since it is larger than the sum of its proper divisors (337869890).

665395678 is a wasteful number, since it uses less digits than its factorization.

665395678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724018.

The product of its digits is 8164800, while the sum is 55.

The square root of 665395678 is about 25795.2646429534. The cubic root of 665395678 is about 873.0249561290.

The spelling of 665395678 in words is "six hundred sixty-five million, three hundred ninety-five thousand, six hundred seventy-eight".