66105011555 has 32 divisors (see below), whose sum is σ = 88714579968. Its totient is φ = 46868627200.

The previous prime is 66105011501. The next prime is 66105011561. The reversal of 66105011555 is 55511050166.

It is not a de Polignac number, because 66105011555 - 2²⁰ = 66103962979 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 3207614 + ... + 3228156.

It is an arithmetic number, because the mean of its divisors is an integer number (2772330624).

Almost surely, 2^66105011555 is an apocalyptic number.

66105011555 is a deficient number, since it is larger than the sum of its proper divisors (22609568413).

66105011555 is a wasteful number, since it uses less digits than its factorization.

66105011555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22027.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 66105011555 in words is "sixty-six billion, one hundred five million, eleven thousand, five hundred fifty-five".