669884641 has 4 divisors (see below), whose sum is σ = 672888832. Its totient is φ = 666880452.

The previous prime is 669884639. The next prime is 669884647. The reversal of 669884641 is 146488966.

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 669884641 - 2¹ = 669884639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669884647) 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, 1501761 + ... + 1502206.

It is an arithmetic number, because the mean of its divisors is an integer number (168222208).

Almost surely, 2^669884641 is an apocalyptic number.

It is an amenable number.

669884641 is a deficient number, since it is larger than the sum of its proper divisors (3004191).

669884641 is a wasteful number, since it uses less digits than its factorization.

669884641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004190.

The product of its digits is 1990656, while the sum is 52.

The square root of 669884641 is about 25882.1297616715. The cubic root of 669884641 is about 874.9837889786.

The spelling of 669884641 in words is "six hundred sixty-nine million, eight hundred eighty-four thousand, six hundred forty-one".