66220726255 has 16 divisors (see below), whose sum is σ = 80268446304. Its totient is φ = 52441084800.

The previous prime is 66220726249. The next prime is 66220726259. The reversal of 66220726255 is 55262702266.

It is not a de Polignac number, because 66220726255 - 2⁵ = 66220726223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66220726259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3101677 + ... + 3122953.

It is an arithmetic number, because the mean of its divisors is an integer number (5016777894).

Almost surely, 2^66220726255 is an apocalyptic number.

66220726255 is a deficient number, since it is larger than the sum of its proper divisors (14047720049).

66220726255 is a wasteful number, since it uses less digits than its factorization.

66220726255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27546.

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 66220726255 in words is "sixty-six billion, two hundred twenty million, seven hundred twenty-six thousand, two hundred fifty-five".