665395201 has 4 divisors (see below), whose sum is σ = 680869552. Its totient is φ = 649920852.

The previous prime is 665395153. The next prime is 665395207. The reversal of 665395201 is 102593566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665395201 - 2¹¹ = 665393153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665395207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7737111 + ... + 7737196.

It is an arithmetic number, because the mean of its divisors is an integer number (170217388).

Almost surely, 2^665395201 is an apocalyptic number.

It is an amenable number.

665395201 is a deficient number, since it is larger than the sum of its proper divisors (15474351).

665395201 is a wasteful number, since it uses less digits than its factorization.

665395201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15474350.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 665395201 is about 25795.2553970687. The cubic root of 665395201 is about 873.0247475147.

The spelling of 665395201 in words is "six hundred sixty-five million, three hundred ninety-five thousand, two hundred one".