1666052257 has 2 divisors, whose sum is σ = 1666052258. Its totient is φ = 1666052256.

The previous prime is 1666052197. The next prime is 1666052279. The reversal of 1666052257 is 7522506661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1180334736 + 485717521 = 34356^2 + 22039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666052257 - 2¹¹ = 1666050209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666052057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833026128 + 833026129.

It is an arithmetic number, because the mean of its divisors is an integer number (833026129).

Almost surely, 2^1666052257 is an apocalyptic number.

It is an amenable number.

1666052257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666052257 is an equidigital number, since it uses as much as digits as its factorization.

1666052257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 1666052257 is about 40817.3034018662. The cubic root of 1666052257 is about 1185.4853909481.

The spelling of 1666052257 in words is "one billion, six hundred sixty-six million, fifty-two thousand, two hundred fifty-seven".