66254105123 has 2 divisors, whose sum is σ = 66254105124. Its totient is φ = 66254105122.

The previous prime is 66254105119. The next prime is 66254105129. The reversal of 66254105123 is 32150145266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66254105123 - 2² = 66254105119 is a prime.

It is not a weakly prime, because it can be changed into another prime (66254105129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33127052561 + 33127052562.

It is an arithmetic number, because the mean of its divisors is an integer number (33127052562).

Almost surely, 2^66254105123 is an apocalyptic number.

66254105123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66254105123 is an equidigital number, since it uses as much as digits as its factorization.

66254105123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 66254105123 in words is "sixty-six billion, two hundred fifty-four million, one hundred five thousand, one hundred twenty-three".