1666000057 has 2 divisors, whose sum is σ = 1666000058. Its totient is φ = 1666000056.

The previous prime is 1666000043. The next prime is 1666000069. The reversal of 1666000057 is 7500006661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1414587321 + 251412736 = 37611^2 + 15856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666000057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1665999992 and 1666000028.

It is not a weakly prime, because it can be changed into another prime (1666000657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833000028 + 833000029.

It is an arithmetic number, because the mean of its divisors is an integer number (833000029).

Almost surely, 2^1666000057 is an apocalyptic number.

It is an amenable number.

1666000057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666000057 is an equidigital number, since it uses as much as digits as its factorization.

1666000057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1666000057 is about 40816.6639621613. The cubic root of 1666000057 is about 1185.4730097870.

The spelling of 1666000057 in words is "one billion, six hundred sixty-six million, fifty-seven", and thus it is an aban number.