66535818253 has 2 divisors, whose sum is σ = 66535818254. Its totient is φ = 66535818252.

The previous prime is 66535818233. The next prime is 66535818257. The reversal of 66535818253 is 35281853566.

66535818253 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., 47133278404 + 19402539849 = 217102^2 + 139293^2 .

It is a cyclic number.

It is not a de Polignac number, because 66535818253 - 2⁵ = 66535818221 is a prime.

It is a super-2 number, since 2×66535818253² (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 66535818253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66535818257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33267909126 + 33267909127.

It is an arithmetic number, because the mean of its divisors is an integer number (33267909127).

Almost surely, 2^66535818253 is an apocalyptic number.

It is an amenable number.

66535818253 is a deficient number, since it is larger than the sum of its proper divisors (1).

66535818253 is an equidigital number, since it uses as much as digits as its factorization.

66535818253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184000, while the sum is 52.

The spelling of 66535818253 in words is "sixty-six billion, five hundred thirty-five million, eight hundred eighteen thousand, two hundred fifty-three".