665606325433407 has 16 divisors (see below), whose sum is σ = 909207609509472. Its totient is φ = 432873361889280.

The previous prime is 665606325433397. The next prime is 665606325433477. The reversal of 665606325433407 is 704334523606566.

It is not a de Polignac number, because 665606325433407 - 2⁴ = 665606325433391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665606325433477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256964338 + ... + 259541679.

It is an arithmetic number, because the mean of its divisors is an integer number (56825475594342).

Almost surely, 2^{665606325433407} is an apocalyptic number.

665606325433407 is a deficient number, since it is larger than the sum of its proper divisors (243601284076065).

665606325433407 is a wasteful number, since it uses less digits than its factorization.

665606325433407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516516538.

The product of its (nonzero) digits is 195955200, while the sum is 60.

The spelling of 665606325433407 in words is "six hundred sixty-five trillion, six hundred six billion, three hundred twenty-five million, four hundred thirty-three thousand, four hundred seven".