66888888888839 has 2 divisors, whose sum is σ = 66888888888840. Its totient is φ = 66888888888838.

The previous prime is 66888888888817. The next prime is 66888888888881. The reversal of 66888888888839 is 93888888888866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66888888888839 - 2¹² = 66888888884743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66888888885839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33444444444419 + 33444444444420.

It is an arithmetic number, because the mean of its divisors is an integer number (33444444444420).

Almost surely, 2^{66888888888839} is an apocalyptic number.

66888888888839 is a deficient number, since it is larger than the sum of its proper divisors (1).

66888888888839 is an equidigital number, since it uses as much as digits as its factorization.

66888888888839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1043677052928, while the sum is 104.

The spelling of 66888888888839 in words is "sixty-six trillion, eight hundred eighty-eight billion, eight hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred thirty-nine".