66653660041 has 2 divisors, whose sum is σ = 66653660042. Its totient is φ = 66653660040.

The previous prime is 66653659981. The next prime is 66653660089. The reversal of 66653660041 is 14006635666.

66653660041 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41607432441 + 25046227600 = 203979^2 + 158260^2 .

It is a cyclic number.

It is not a de Polignac number, because 66653660041 - 2⁷ = 66653659913 is a prime.

It is a super-2 number, since 2×66653660041² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66653660041.

It is not a weakly prime, because it can be changed into another prime (66653660141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33326830020 + 33326830021.

It is an arithmetic number, because the mean of its divisors is an integer number (33326830021).

Almost surely, 2^66653660041 is an apocalyptic number.

It is an amenable number.

66653660041 is a deficient number, since it is larger than the sum of its proper divisors (1).

66653660041 is an equidigital number, since it uses as much as digits as its factorization.

66653660041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 66653660041 in words is "sixty-six billion, six hundred fifty-three million, six hundred sixty thousand, forty-one".