1666552205 has 8 divisors (see below), whose sum is σ = 2000725272. Its totient is φ = 1332666688.

The previous prime is 1666552201. The next prime is 1666552207. The reversal of 1666552205 is 5022556661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 167081476 + 1499470729 = 12926^2 + 38723^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666552205 - 2² = 1666552201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666552201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58922 + ... + 82491.

It is an arithmetic number, because the mean of its divisors is an integer number (250090659).

Almost surely, 2^1666552205 is an apocalyptic number.

It is an amenable number.

1666552205 is a deficient number, since it is larger than the sum of its proper divisors (334173067).

1666552205 is a wasteful number, since it uses less digits than its factorization.

1666552205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143775.

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 1666552205 is about 40823.4271589243. The cubic root of 1666552205 is about 1185.6039590129.

The spelling of 1666552205 in words is "one billion, six hundred sixty-six million, five hundred fifty-two thousand, two hundred five".