669556220 has 48 divisors (see below), whose sum is σ = 1553525568. Its totient is φ = 241105920.

The previous prime is 669556213. The next prime is 669556229. The reversal of 669556220 is 22655966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669556229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34991 + ... + 50630.

It is an arithmetic number, because the mean of its divisors is an integer number (32365116).

Almost surely, 2^669556220 is an apocalyptic number.

It is an amenable number.

669556220 is an abundant number, since it is smaller than the sum of its proper divisors (883969348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669556220 is a wasteful number, since it uses less digits than its factorization.

669556220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85670 (or 85668 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 669556220 is about 25875.7844325539. The cubic root of 669556220 is about 874.8407742924.

The spelling of 669556220 in words is "six hundred sixty-nine million, five hundred fifty-six thousand, two hundred twenty".