1666759417 has 2 divisors, whose sum is σ = 1666759418. Its totient is φ = 1666759416.

The previous prime is 1666759403. The next prime is 1666759447. The reversal of 1666759417 is 7149576661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1427252841 + 239506576 = 37779^2 + 15476^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666759417 - 2¹¹ = 1666757369 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666759447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833379708 + 833379709.

It is an arithmetic number, because the mean of its divisors is an integer number (833379709).

Almost surely, 2^1666759417 is an apocalyptic number.

It is an amenable number.

1666759417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666759417 is an equidigital number, since it uses as much as digits as its factorization.

1666759417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 52.

The square root of 1666759417 is about 40825.9649855334. The cubic root of 1666759417 is about 1185.6530946247.

The spelling of 1666759417 in words is "one billion, six hundred sixty-six million, seven hundred fifty-nine thousand, four hundred seventeen".