66516849041 has 2 divisors, whose sum is σ = 66516849042. Its totient is φ = 66516849040.

The previous prime is 66516849031. The next prime is 66516849097. The reversal of 66516849041 is 14094861566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64333249600 + 2183599441 = 253640^2 + 46729^2 .

It is a cyclic number.

It is not a de Polignac number, because 66516849041 - 2¹⁸ = 66516586897 is a prime.

It is not a weakly prime, because it can be changed into another prime (66516849001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33258424520 + 33258424521.

It is an arithmetic number, because the mean of its divisors is an integer number (33258424521).

Almost surely, 2^66516849041 is an apocalyptic number.

It is an amenable number.

66516849041 is a deficient number, since it is larger than the sum of its proper divisors (1).

66516849041 is an equidigital number, since it uses as much as digits as its factorization.

66516849041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 66516849041 in words is "sixty-six billion, five hundred sixteen million, eight hundred forty-nine thousand, forty-one".