66556555150605 has 32 divisors (see below), whose sum is σ = 115128298059264. Its totient is φ = 32638808702976.

The previous prime is 66556555150577. The next prime is 66556555150609. The reversal of 66556555150605 is 50605155565566.

It is a happy number.

66556555150605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66556555150605 - 2⁶ = 66556555150541 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66556555150609) 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 31 ways as a sum of consecutive naturals, for example, 663988149 + ... + 664088378.

It is an arithmetic number, because the mean of its divisors is an integer number (3597759314352).

Almost surely, 2^{66556555150605} is an apocalyptic number.

66556555150605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66556555150605 is a deficient number, since it is larger than the sum of its proper divisors (48571742908659).

66556555150605 is a wasteful number, since it uses less digits than its factorization.

66556555150605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328076805.

The product of its (nonzero) digits is 101250000, while the sum is 60.

The spelling of 66556555150605 in words is "sixty-six trillion, five hundred fifty-six billion, five hundred fifty-five million, one hundred fifty thousand, six hundred five".