1660663117 has 2 divisors, whose sum is σ = 1660663118. Its totient is φ = 1660663116.

The previous prime is 1660663097. The next prime is 1660663127. The reversal of 1660663117 is 7113660661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1237702761 + 422960356 = 35181^2 + 20566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660663117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660663127) 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, 830331558 + 830331559.

It is an arithmetic number, because the mean of its divisors is an integer number (830331559).

Almost surely, 2^1660663117 is an apocalyptic number.

It is an amenable number.

1660663117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660663117 is an equidigital number, since it uses as much as digits as its factorization.

1660663117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1660663117 is about 40751.2345457165. The cubic root of 1660663117 is about 1184.2057896974.

The spelling of 1660663117 in words is "one billion, six hundred sixty million, six hundred sixty-three thousand, one hundred seventeen".