669654225 has 72 divisors (see below), whose sum is σ = 1313989560. Its totient is φ = 324495360.

The previous prime is 669654217. The next prime is 669654229. The reversal of 669654225 is 522456966.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 175748049 + 493906176 = 13257^2 + 22224^2 .

It is not a de Polignac number, because 669654225 - 2³ = 669654217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (669654229) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 107907 + ... + 113943.

It is an arithmetic number, because the mean of its divisors is an integer number (18249855).

Almost surely, 2^669654225 is an apocalyptic number.

It is an amenable number.

669654225 is a deficient number, since it is larger than the sum of its proper divisors (644335335).

669654225 is a wasteful number, since it uses less digits than its factorization.

669654225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6099 (or 6091 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 669654225 is about 25877.6781222736. The cubic root of 669654225 is about 874.8834565868.

The spelling of 669654225 in words is "six hundred sixty-nine million, six hundred fifty-four thousand, two hundred twenty-five".