665393047 has 16 divisors (see below), whose sum is σ = 731808000. Its totient is φ = 599990400.

The previous prime is 665393033. The next prime is 665393117. The reversal of 665393047 is 740393566.

It is a cyclic number.

It is not a de Polignac number, because 665393047 - 2¹⁵ = 665360279 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665392994 and 665393012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665393017) 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 15 ways as a sum of consecutive naturals, for example, 1322598 + ... + 1323100.

It is an arithmetic number, because the mean of its divisors is an integer number (45738000).

Almost surely, 2^665393047 is an apocalyptic number.

665393047 is a deficient number, since it is larger than the sum of its proper divisors (66414953).

665393047 is a wasteful number, since it uses less digits than its factorization.

665393047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254.

The product of its (nonzero) digits is 408240, while the sum is 43.

The square root of 665393047 is about 25795.2136451707. The cubic root of 665393047 is about 873.0238054694.

The spelling of 665393047 in words is "six hundred sixty-five million, three hundred ninety-three thousand, forty-seven".