66330513553 has 2 divisors, whose sum is σ = 66330513554. Its totient is φ = 66330513552.

The previous prime is 66330513539. The next prime is 66330513577. The reversal of 66330513553 is 35531503366.

66330513553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57423495424 + 8907018129 = 239632^2 + 94377^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66330513553 is a prime.

It is not a weakly prime, because it can be changed into another prime (66330513503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33165256776 + 33165256777.

It is an arithmetic number, because the mean of its divisors is an integer number (33165256777).

Almost surely, 2^66330513553 is an apocalyptic number.

It is an amenable number.

66330513553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66330513553 is an equidigital number, since it uses as much as digits as its factorization.

66330513553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 364500, while the sum is 40.

The spelling of 66330513553 in words is "sixty-six billion, three hundred thirty million, five hundred thirteen thousand, five hundred fifty-three".