66111802281 has 24 divisors (see below), whose sum is σ = 109145774400. Its totient is φ = 37775115936.

The previous prime is 66111802259. The next prime is 66111802283. The reversal of 66111802281 is 18220811166.

66111802281 is a `hidden beast` number, since 6 + 611 + 18 + 0 + 2 + 28 + 1 = 666.

It is not a de Polignac number, because 66111802281 - 2¹⁵ = 66111769513 is a prime.

It is a super-2 number, since 2×66111802281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66111802283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 910870 + ... + 980768.

It is an arithmetic number, because the mean of its divisors is an integer number (4547740600).

Almost surely, 2^66111802281 is an apocalyptic number.

It is an amenable number.

66111802281 is a deficient number, since it is larger than the sum of its proper divisors (43033972119).

66111802281 is a wasteful number, since it uses less digits than its factorization.

66111802281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84925 (or 84922 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 66111802281 in words is "sixty-six billion, one hundred eleven million, eight hundred two thousand, two hundred eighty-one".