1666379513 has 2 divisors, whose sum is σ = 1666379514. Its totient is φ = 1666379512.

The previous prime is 1666379489. The next prime is 1666379521. The reversal of 1666379513 is 3159736661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1404975289 + 261404224 = 37483^2 + 16168^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666379513 - 2⁸ = 1666379257 is a prime.

It is a super-2 number, since 2×1666379513² = 5553641362692234338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1666379543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833189756 + 833189757.

It is an arithmetic number, because the mean of its divisors is an integer number (833189757).

Almost surely, 2^1666379513 is an apocalyptic number.

It is an amenable number.

1666379513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666379513 is an equidigital number, since it uses as much as digits as its factorization.

1666379513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 612360, while the sum is 47.

The square root of 1666379513 is about 40821.3119950841. The cubic root of 1666379513 is about 1185.5630059221.

The spelling of 1666379513 in words is "one billion, six hundred sixty-six million, three hundred seventy-nine thousand, five hundred thirteen".