669044001817 has 4 divisors (see below), whose sum is σ = 669183769296. Its totient is φ = 668904234340.

The previous prime is 669044001779. The next prime is 669044001869. The reversal of 669044001817 is 718100440966.

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 669044001817 - 2¹¹ = 669043999769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669044301817) 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, 69876559 + ... + 69886132.

It is an arithmetic number, because the mean of its divisors is an integer number (167295942324).

Almost surely, 2^669044001817 is an apocalyptic number.

It is an amenable number.

669044001817 is a deficient number, since it is larger than the sum of its proper divisors (139767479).

669044001817 is a wasteful number, since it uses less digits than its factorization.

669044001817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139767478.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 669044001817 in words is "six hundred sixty-nine billion, forty-four million, one thousand, eight hundred seventeen".