665655065 has 8 divisors (see below), whose sum is σ = 800150400. Its totient is φ = 531614512.

The previous prime is 665655047. The next prime is 665655073. The reversal of 665655065 is 560556566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665655065 - 2⁸ = 665654809 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110465 + ... + 116334.

It is an arithmetic number, because the mean of its divisors is an integer number (100018800).

Almost surely, 2^665655065 is an apocalyptic number.

It is an amenable number.

665655065 is a deficient number, since it is larger than the sum of its proper divisors (134495335).

665655065 is a wasteful number, since it uses less digits than its factorization.

665655065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227391.

The product of its (nonzero) digits is 810000, while the sum is 44.

The square root of 665655065 is about 25800.2919557124. The cubic root of 665655065 is about 873.1383833287.

The spelling of 665655065 in words is "six hundred sixty-five million, six hundred fifty-five thousand, sixty-five".