66542273161 has 16 divisors (see below), whose sum is σ = 82693321984. Its totient is φ = 52137670464.

The previous prime is 66542273129. The next prime is 66542273179. The reversal of 66542273161 is 16137224566.

It is a cyclic number.

It is not a de Polignac number, because 66542273161 - 2⁵ = 66542273129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66542273101) 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, 3540306 + ... + 3559051.

It is an arithmetic number, because the mean of its divisors is an integer number (5168332624).

Almost surely, 2^66542273161 is an apocalyptic number.

It is an amenable number.

66542273161 is a deficient number, since it is larger than the sum of its proper divisors (16151048823).

66542273161 is a wasteful number, since it uses less digits than its factorization.

66542273161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7099480.

The product of its digits is 362880, while the sum is 43.

The spelling of 66542273161 in words is "sixty-six billion, five hundred forty-two million, two hundred seventy-three thousand, one hundred sixty-one".