66838266555 has 16 divisors (see below), whose sum is σ = 107082514464. Its totient is φ = 35599979520.

The previous prime is 66838266511. The next prime is 66838266559. The reversal of 66838266555 is 55566283866.

It is not a de Polignac number, because 66838266555 - 2⁹ = 66838266043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66838266559) 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 in 15 ways as a sum of consecutive naturals, for example, 2931766 + ... + 2954475.

It is an arithmetic number, because the mean of its divisors is an integer number (6692657154).

Almost surely, 2^66838266555 is an apocalyptic number.

66838266555 is a deficient number, since it is larger than the sum of its proper divisors (40244247909).

66838266555 is a wasteful number, since it uses less digits than its factorization.

66838266555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5887006.

The product of its digits is 62208000, while the sum is 60.

The spelling of 66838266555 in words is "sixty-six billion, eight hundred thirty-eight million, two hundred sixty-six thousand, five hundred fifty-five".