1666315039 has 2 divisors, whose sum is σ = 1666315040. Its totient is φ = 1666315038.

The previous prime is 1666314997. The next prime is 1666315043. The reversal of 1666315039 is 9305136661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666315039 - 2⁹ = 1666314527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666314992 and 1666315010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666315099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833157519 + 833157520.

It is an arithmetic number, because the mean of its divisors is an integer number (833157520).

Almost surely, 2^1666315039 is an apocalyptic number.

1666315039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666315039 is an equidigital number, since it uses as much as digits as its factorization.

1666315039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 1666315039 is about 40820.5222774036. The cubic root of 1666315039 is about 1185.5477154927.

The spelling of 1666315039 in words is "one billion, six hundred sixty-six million, three hundred fifteen thousand, thirty-nine".