1661050117 has 2 divisors, whose sum is σ = 1661050118. Its totient is φ = 1661050116.

The previous prime is 1661050099. The next prime is 1661050121. The reversal of 1661050117 is 7110501661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1331228196 + 329821921 = 36486^2 + 18161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1661050117 - 2⁷ = 1661049989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1661050147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830525058 + 830525059.

It is an arithmetic number, because the mean of its divisors is an integer number (830525059).

Almost surely, 2^1661050117 is an apocalyptic number.

It is an amenable number.

1661050117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1661050117 is an equidigital number, since it uses as much as digits as its factorization.

1661050117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 28.

The square root of 1661050117 is about 40755.9825915165. The cubic root of 1661050117 is about 1184.2977714367.

Adding to 1661050117 its reverse (7110501661), we get a palindrome (8771551778).

The spelling of 1661050117 in words is "one billion, six hundred sixty-one million, fifty thousand, one hundred seventeen".