665374605 has 32 divisors (see below), whose sum is σ = 1221951744. Its totient is φ = 302854656.

The previous prime is 665374603. The next prime is 665374627. The reversal of 665374605 is 506473566.

It is not a de Polignac number, because 665374605 - 2¹ = 665374603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665374603) 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 31 ways as a sum of consecutive naturals, for example, 10867 + ... + 38063.

It is an arithmetic number, because the mean of its divisors is an integer number (38185992).

Almost surely, 2^665374605 is an apocalyptic number.

It is an amenable number.

665374605 is a deficient number, since it is larger than the sum of its proper divisors (556577139).

665374605 is a wasteful number, since it uses less digits than its factorization.

665374605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27445.

The product of its (nonzero) digits is 453600, while the sum is 42.

The square root of 665374605 is about 25794.8561732761. The cubic root of 665374605 is about 873.0157398337.

The spelling of 665374605 in words is "six hundred sixty-five million, three hundred seventy-four thousand, six hundred five".