660005565567 has 4 divisors (see below), whose sum is σ = 880007420760. Its totient is φ = 440003710376.

The previous prime is 660005565553. The next prime is 660005565577. The reversal of 660005565567 is 765565500066.

It is a happy number.

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 660005565567 - 2¹⁵ = 660005532799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660005565517) 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, 110000927592 + ... + 110000927597.

It is an arithmetic number, because the mean of its divisors is an integer number (220001855190).

Almost surely, 2^660005565567 is an apocalyptic number.

660005565567 is a deficient number, since it is larger than the sum of its proper divisors (220001855193).

660005565567 is a wasteful number, since it uses less digits than its factorization.

660005565567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220001855192.

The product of its (nonzero) digits is 5670000, while the sum is 51.

The spelling of 660005565567 in words is "six hundred sixty billion, five million, five hundred sixty-five thousand, five hundred sixty-seven".