66240075281 has 16 divisors (see below), whose sum is σ = 68524959360. Its totient is φ = 63990622080.

The previous prime is 66240075197. The next prime is 66240075287. The reversal of 66240075281 is 18257004266.

It is a cyclic number.

It is not a de Polignac number, because 66240075281 - 2³⁰ = 65166333457 is a prime.

It is a super-2 number, since 2×66240075281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66240075287) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3662621 + ... + 3680661.

It is an arithmetic number, because the mean of its divisors is an integer number (4282809960).

Almost surely, 2^66240075281 is an apocalyptic number.

It is an amenable number.

66240075281 is a deficient number, since it is larger than the sum of its proper divisors (2284884079).

66240075281 is a wasteful number, since it uses less digits than its factorization.

66240075281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19016.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 66240075281 in words is "sixty-six billion, two hundred forty million, seventy-five thousand, two hundred eighty-one".