66655361519 has 2 divisors, whose sum is σ = 66655361520. Its totient is φ = 66655361518.

The previous prime is 66655361501. The next prime is 66655361561. The reversal of 66655361519 is 91516355666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66655361519 - 2⁸ = 66655361263 is a prime.

It is a super-2 number, since 2×66655361519² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66655361219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327680759 + 33327680760.

It is an arithmetic number, because the mean of its divisors is an integer number (33327680760).

Almost surely, 2^66655361519 is an apocalyptic number.

66655361519 is a deficient number, since it is larger than the sum of its proper divisors (1).

66655361519 is an equidigital number, since it uses as much as digits as its factorization.

66655361519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374000, while the sum is 53.

The spelling of 66655361519 in words is "sixty-six billion, six hundred fifty-five million, three hundred sixty-one thousand, five hundred nineteen".