66554854558919 has 2 divisors, whose sum is σ = 66554854558920. Its totient is φ = 66554854558918.

The previous prime is 66554854558847. The next prime is 66554854558921. The reversal of 66554854558919 is 91985545845566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66554854558919 - 2²⁸ = 66554586123463 is a prime.

It is a super-2 number, since 2×66554854558919² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 66554854558921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66554854558949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33277427279459 + 33277427279460.

It is an arithmetic number, because the mean of its divisors is an integer number (33277427279460).

Almost surely, 2^{66554854558919} is an apocalyptic number.

66554854558919 is a deficient number, since it is larger than the sum of its proper divisors (1).

66554854558919 is an equidigital number, since it uses as much as digits as its factorization.

66554854558919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9331200000, while the sum is 80.

The spelling of 66554854558919 in words is "sixty-six trillion, five hundred fifty-four billion, eight hundred fifty-four million, five hundred fifty-eight thousand, nine hundred nineteen".