665352047 has 4 divisors (see below), whose sum is σ = 666301896. Its totient is φ = 664402200.

The previous prime is 665352043. The next prime is 665352049. The reversal of 665352047 is 740253566.

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 665352047 - 2² = 665352043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665352047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665352041) 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 3 ways as a sum of consecutive naturals, for example, 473873 + ... + 475274.

It is an arithmetic number, because the mean of its divisors is an integer number (166575474).

Almost surely, 2^665352047 is an apocalyptic number.

665352047 is a deficient number, since it is larger than the sum of its proper divisors (949849).

665352047 is an equidigital number, since it uses as much as digits as its factorization.

665352047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949848.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 665352047 is about 25794.4189118499. The cubic root of 665352047 is about 873.0058738567.

The spelling of 665352047 in words is "six hundred sixty-five million, three hundred fifty-two thousand, forty-seven".