545659666955521 has 2 divisors, whose sum is σ = 545659666955522. Its totient is φ = 545659666955520.

The previous prime is 545659666955503. The next prime is 545659666955603. The reversal of 545659666955521 is 125559666956545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 468377722225296 + 77281944730225 = 21642036^2 + 8791015^2 .

It is a cyclic number.

It is not a de Polignac number, because 545659666955521 - 2¹⁷ = 545659666824449 is a prime.

It is not a weakly prime, because it can be changed into another prime (545659666925521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272829833477760 + 272829833477761.

It is an arithmetic number, because the mean of its divisors is an integer number (272829833477761).

Almost surely, 2^{545659666955521} is an apocalyptic number.

It is an amenable number.

545659666955521 is a deficient number, since it is larger than the sum of its proper divisors (1).

545659666955521 is an equidigital number, since it uses as much as digits as its factorization.

545659666955521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13122000000, while the sum is 79.

The spelling of 545659666955521 in words is "five hundred forty-five trillion, six hundred fifty-nine billion, six hundred sixty-six million, nine hundred fifty-five thousand, five hundred twenty-one".