665011567 has 4 divisors (see below), whose sum is σ = 725467176. Its totient is φ = 604555960.

The previous prime is 665011553. The next prime is 665011577. The reversal of 665011567 is 765110566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665011567 - 2⁷ = 665011439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665011517) 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 3 ways as a sum of consecutive naturals, for example, 30227788 + ... + 30227809.

It is an arithmetic number, because the mean of its divisors is an integer number (181366794).

Almost surely, 2^665011567 is an apocalyptic number.

665011567 is a deficient number, since it is larger than the sum of its proper divisors (60455609).

665011567 is a wasteful number, since it uses less digits than its factorization.

665011567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60455608.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 665011567 is about 25787.8181899904. The cubic root of 665011567 is about 872.8569342800.

The spelling of 665011567 in words is "six hundred sixty-five million, eleven thousand, five hundred sixty-seven".