1666555552 has 12 divisors (see below), whose sum is σ = 3281031306. Its totient is φ = 833277760.

The previous prime is 1666555547. The next prime is 1666555573. The reversal of 1666555552 is 2555556661.

It can be written as a sum of positive squares in only one way, i.e., 1213546896 + 453008656 = 34836^2 + 21284^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26039899 + ... + 26039962.

Almost surely, 2^1666555552 is an apocalyptic number.

It is an amenable number.

1666555552 is a deficient number, since it is larger than the sum of its proper divisors (1614475754).

1666555552 is an equidigital number, since it uses as much as digits as its factorization.

1666555552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52079871 (or 52079863 counting only the distinct ones).

The product of its digits is 1350000, while the sum is 46.

The square root of 1666555552 is about 40823.4681525223. The cubic root of 1666555552 is about 1185.6047527102.

The spelling of 1666555552 in words is "one billion, six hundred sixty-six million, five hundred fifty-five thousand, five hundred fifty-two".