66881334859 has 2 divisors, whose sum is σ = 66881334860. Its totient is φ = 66881334858.

The previous prime is 66881334857. The next prime is 66881334901. The reversal of 66881334859 is 95843318866.

66881334859 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66881334859 - 2¹ = 66881334857 is a prime.

It is a super-2 number, since 2×66881334859² (a number of 22 digits) contains 22 as substring.

Together with 66881334857, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 66881334797 and 66881334806.

It is not a weakly prime, because it can be changed into another prime (66881334857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33440667429 + 33440667430.

It is an arithmetic number, because the mean of its divisors is an integer number (33440667430).

Almost surely, 2^66881334859 is an apocalyptic number.

66881334859 is a deficient number, since it is larger than the sum of its proper divisors (1).

66881334859 is an equidigital number, since it uses as much as digits as its factorization.

66881334859 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 66881334859 in words is "sixty-six billion, eight hundred eighty-one million, three hundred thirty-four thousand, eight hundred fifty-nine".