665384745 has 16 divisors (see below), whose sum is σ = 1071150912. Its totient is φ = 352693440.

The previous prime is 665384701. The next prime is 665384749. The reversal of 665384745 is 547483566.

It is not a de Polignac number, because 665384745 - 2¹³ = 665376553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665384694 and 665384703.

It is not an unprimeable number, because it can be changed into a prime (665384749) 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, 133626 + ... + 138515.

It is an arithmetic number, because the mean of its divisors is an integer number (66946932).

Almost surely, 2^665384745 is an apocalyptic number.

It is an amenable number.

665384745 is a deficient number, since it is larger than the sum of its proper divisors (405766167).

665384745 is a wasteful number, since it uses less digits than its factorization.

665384745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272312.

The product of its digits is 2419200, while the sum is 48.

The square root of 665384745 is about 25795.0527233421. The cubic root of 665384745 is about 873.0201745960.

The spelling of 665384745 in words is "six hundred sixty-five million, three hundred eighty-four thousand, seven hundred forty-five".