1661417113 has 2 divisors, whose sum is σ = 1661417114. Its totient is φ = 1661417112.

The previous prime is 1661417083. The next prime is 1661417117. The reversal of 1661417113 is 3117141661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1658769984 + 2647129 = 40728^2 + 1627^2 .

It is a cyclic number.

It is not a de Polignac number, because 1661417113 - 2⁵ = 1661417081 is a prime.

It is not a weakly prime, because it can be changed into another prime (1661417117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830708556 + 830708557.

It is an arithmetic number, because the mean of its divisors is an integer number (830708557).

Almost surely, 2^1661417113 is an apocalyptic number.

It is an amenable number.

1661417113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661417113 is an equidigital number, since it uses as much as digits as its factorization.

1661417113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1661417113 is about 40760.4847002584. The cubic root of 1661417113 is about 1184.3849854497.

Adding to 1661417113 its reverse (3117141661), we get a palindrome (4778558774).

The spelling of 1661417113 in words is "one billion, six hundred sixty-one million, four hundred seventeen thousand, one hundred thirteen".