669564827 has 4 divisors (see below), whose sum is σ = 670626576. Its totient is φ = 668503080.

The previous prime is 669564821. The next prime is 669564829. The reversal of 669564827 is 728465966.

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 669564827 - 2¹⁴ = 669548443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669564821) 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, 529928 + ... + 531189.

It is an arithmetic number, because the mean of its divisors is an integer number (167656644).

Almost surely, 2^669564827 is an apocalyptic number.

669564827 is a deficient number, since it is larger than the sum of its proper divisors (1061749).

669564827 is a wasteful number, since it uses less digits than its factorization.

669564827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061748.

The product of its digits is 4354560, while the sum is 53.

The square root of 669564827 is about 25875.9507458180. The cubic root of 669564827 is about 874.8445229058.

The spelling of 669564827 in words is "six hundred sixty-nine million, five hundred sixty-four thousand, eight hundred twenty-seven".