665312371 has 8 divisors (see below), whose sum is σ = 682353504. Its totient is φ = 648310080.

The previous prime is 665312369. The next prime is 665312399. The reversal of 665312371 is 173213566.

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 665312371 - 2¹ = 665312369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665312471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26706 + ... + 45208.

It is an arithmetic number, because the mean of its divisors is an integer number (85294188).

Almost surely, 2^665312371 is an apocalyptic number.

665312371 is a deficient number, since it is larger than the sum of its proper divisors (17041133).

665312371 is a wasteful number, since it uses less digits than its factorization.

665312371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19421.

The product of its digits is 22680, while the sum is 34.

The square root of 665312371 is about 25793.6498192869. The cubic root of 665312371 is about 872.9885206025.

The spelling of 665312371 in words is "six hundred sixty-five million, three hundred twelve thousand, three hundred seventy-one".