66541367549 has 2 divisors, whose sum is σ = 66541367550. Its totient is φ = 66541367548.

The previous prime is 66541367527. The next prime is 66541367569. The reversal of 66541367549 is 94576314566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43896535225 + 22644832324 = 209515^2 + 150482^2 .

It is a cyclic number.

It is not a de Polignac number, because 66541367549 - 2⁸ = 66541367293 is a prime.

It is a super-2 number, since 2×66541367549² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66541367494 and 66541367503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66541367569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33270683774 + 33270683775.

It is an arithmetic number, because the mean of its divisors is an integer number (33270683775).

Almost surely, 2^66541367549 is an apocalyptic number.

It is an amenable number.

66541367549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66541367549 is an equidigital number, since it uses as much as digits as its factorization.

66541367549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16329600, while the sum is 56.

The spelling of 66541367549 in words is "sixty-six billion, five hundred forty-one million, three hundred sixty-seven thousand, five hundred forty-nine".