1666502540011 has 2 divisors, whose sum is σ = 1666502540012. Its totient is φ = 1666502540010.

The previous prime is 1666502539991. The next prime is 1666502540023. The reversal of 1666502540011 is 1100452056661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666502540011 - 2²⁹ = 1665965669099 is a prime.

It is a super-2 number, since 2×1666502540011² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1666502540081) 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, 833251270005 + 833251270006.

It is an arithmetic number, because the mean of its divisors is an integer number (833251270006).

Almost surely, 2^{1666502540011} is an apocalyptic number.

1666502540011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666502540011 is an equidigital number, since it uses as much as digits as its factorization.

1666502540011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

Adding to 1666502540011 its reverse (1100452056661), we get a palindrome (2766954596672).

The spelling of 1666502540011 in words is "one trillion, six hundred sixty-six billion, five hundred two million, five hundred forty thousand, eleven".