669020044321 has 4 divisors (see below), whose sum is σ = 669021718932. Its totient is φ = 669018369712.

The previous prime is 669020044307. The next prime is 669020044331. The reversal of 669020044321 is 123440020966.

It is a happy number.

669020044321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 189193681296 + 479826363025 = 434964^2 + 692695^2 .

It is a cyclic number.

It is not a de Polignac number, because 669020044321 - 2⁷ = 669020044193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669020044331) 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, 150075 + ... + 1166431.

It is an arithmetic number, because the mean of its divisors is an integer number (167255429733).

Almost surely, 2^669020044321 is an apocalyptic number.

It is an amenable number.

669020044321 is a deficient number, since it is larger than the sum of its proper divisors (1674611).

669020044321 is a wasteful number, since it uses less digits than its factorization.

669020044321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674610.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 669020044321 in words is "six hundred sixty-nine billion, twenty million, forty-four thousand, three hundred twenty-one".