665637824227 has 8 divisors (see below), whose sum is σ = 704953577952. Its totient is φ = 626339913600.

The previous prime is 665637824177. The next prime is 665637824237. The reversal of 665637824227 is 722428736566.

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 665637824227 - 2¹⁹ = 665637299939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665637824237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4383924 + ... + 4533217.

It is an arithmetic number, because the mean of its divisors is an integer number (88119197244).

Almost surely, 2^665637824227 is an apocalyptic number.

665637824227 is a deficient number, since it is larger than the sum of its proper divisors (39315753725).

665637824227 is a wasteful number, since it uses less digits than its factorization.

665637824227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8921549.

The product of its digits is 40642560, while the sum is 58.

The spelling of 665637824227 in words is "six hundred sixty-five billion, six hundred thirty-seven million, eight hundred twenty-four thousand, two hundred twenty-seven".