1666317113 has 2 divisors, whose sum is σ = 1666317114. Its totient is φ = 1666317112.

The previous prime is 1666317109. The next prime is 1666317131. The reversal of 1666317113 is 3117136661.

Together with next prime (1666317131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1637982784 + 28334329 = 40472^2 + 5323^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666317113 - 2² = 1666317109 is a prime.

It is a super-2 number, since 2×1666317113² = 5553225442153309538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1666317193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833158556 + 833158557.

It is an arithmetic number, because the mean of its divisors is an integer number (833158557).

Almost surely, 2^1666317113 is an apocalyptic number.

It is an amenable number.

1666317113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666317113 is an equidigital number, since it uses as much as digits as its factorization.

1666317113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 1666317113 is about 40820.5476812842. The cubic root of 1666317113 is about 1185.5482073615.

The spelling of 1666317113 in words is "one billion, six hundred sixty-six million, three hundred seventeen thousand, one hundred thirteen".