66350550553591 has 2 divisors, whose sum is σ = 66350550553592. Its totient is φ = 66350550553590.

The previous prime is 66350550553489. The next prime is 66350550553633. The reversal of 66350550553591 is 19535505505366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66350550553591 - 2³⁵ = 66316190815223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66350550550591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33175275276795 + 33175275276796.

It is an arithmetic number, because the mean of its divisors is an integer number (33175275276796).

Almost surely, 2^{66350550553591} is an apocalyptic number.

66350550553591 is a deficient number, since it is larger than the sum of its proper divisors (1).

66350550553591 is an equidigital number, since it uses as much as digits as its factorization.

66350550553591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45562500, while the sum is 58.

The spelling of 66350550553591 in words is "sixty-six trillion, three hundred fifty billion, five hundred fifty million, five hundred fifty-three thousand, five hundred ninety-one".