1666225528 has 16 divisors (see below), whose sum is σ = 3408188760. Its totient is φ = 757375200.

The previous prime is 1666225469. The next prime is 1666225531. The reversal of 1666225528 is 8255226661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9467103 + ... + 9467278.

Almost surely, 2^1666225528 is an apocalyptic number.

It is an amenable number.

1666225528 is an abundant number, since it is smaller than the sum of its proper divisors (1741963232).

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

1666225528 is a wasteful number, since it uses less digits than its factorization.

1666225528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18934398 (or 18934394 counting only the distinct ones).

The product of its digits is 345600, while the sum is 43.

The square root of 1666225528 is about 40819.4258656341. The cubic root of 1666225528 is about 1185.5264867216.

The spelling of 1666225528 in words is "one billion, six hundred sixty-six million, two hundred twenty-five thousand, five hundred twenty-eight".