1660655111 has 2 divisors, whose sum is σ = 1660655112. Its totient is φ = 1660655110.

The previous prime is 1660655083. The next prime is 1660655147. The reversal of 1660655111 is 1115560661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660655111 - 2¹⁰ = 1660654087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660655011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830327555 + 830327556.

It is an arithmetic number, because the mean of its divisors is an integer number (830327556).

Almost surely, 2^1660655111 is an apocalyptic number.

1660655111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660655111 is an equidigital number, since it uses as much as digits as its factorization.

1660655111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1660655111 is about 40751.1363154452. The cubic root of 1660655111 is about 1184.2038866892.

It can be divided in two parts, 16606 and 55111, that added together give a palindrome (71717).

The spelling of 1660655111 in words is "one billion, six hundred sixty million, six hundred fifty-five thousand, one hundred eleven".