66854686219 has 2 divisors, whose sum is σ = 66854686220. Its totient is φ = 66854686218.

The previous prime is 66854686153. The next prime is 66854686237. The reversal of 66854686219 is 91268645866.

66854686219 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66854686219 - 2¹⁹ = 66854161931 is a prime.

It is a super-2 number, since 2×66854686219² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66854686279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427343109 + 33427343110.

It is an arithmetic number, because the mean of its divisors is an integer number (33427343110).

Almost surely, 2^66854686219 is an apocalyptic number.

66854686219 is a deficient number, since it is larger than the sum of its proper divisors (1).

66854686219 is an equidigital number, since it uses as much as digits as its factorization.

66854686219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29859840, while the sum is 61.

The spelling of 66854686219 in words is "sixty-six billion, eight hundred fifty-four million, six hundred eighty-six thousand, two hundred nineteen".