66556216039 has 2 divisors, whose sum is σ = 66556216040. Its totient is φ = 66556216038.

The previous prime is 66556216031. The next prime is 66556216109. The reversal of 66556216039 is 93061265566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66556216039 - 2³ = 66556216031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66556215983 and 66556216001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66556216031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33278108019 + 33278108020.

It is an arithmetic number, because the mean of its divisors is an integer number (33278108020).

Almost surely, 2^66556216039 is an apocalyptic number.

66556216039 is a deficient number, since it is larger than the sum of its proper divisors (1).

66556216039 is an equidigital number, since it uses as much as digits as its factorization.

66556216039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1749600, while the sum is 49.

The spelling of 66556216039 in words is "sixty-six billion, five hundred fifty-six million, two hundred sixteen thousand, thirty-nine".