665267847 has 8 divisors (see below), whose sum is σ = 925590144. Its totient is φ = 424228728.

The previous prime is 665267809. The next prime is 665267849. The reversal of 665267847 is 748762566.

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

It is not a de Polignac number, because 665267847 - 2⁸ = 665267591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665267847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665267849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4820713 + ... + 4820850.

It is an arithmetic number, because the mean of its divisors is an integer number (115698768).

Almost surely, 2^665267847 is an apocalyptic number.

665267847 is a deficient number, since it is larger than the sum of its proper divisors (260322297).

665267847 is a wasteful number, since it uses less digits than its factorization.

665267847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9641589.

The product of its digits is 3386880, while the sum is 51.

The square root of 665267847 is about 25792.7867241987. The cubic root of 665267847 is about 872.9690461373.

The spelling of 665267847 in words is "six hundred sixty-five million, two hundred sixty-seven thousand, eight hundred forty-seven".