66116655321 has 16 divisors (see below), whose sum is σ = 88301080320. Its totient is φ = 44005064400.

The previous prime is 66116655313. The next prime is 66116655331. The reversal of 66116655321 is 12355661166.

It is not a de Polignac number, because 66116655321 - 2³ = 66116655313 is a prime.

It is a super-2 number, since 2×66116655321² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66116655331) 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, 4908646 + ... + 4922096.

It is an arithmetic number, because the mean of its divisors is an integer number (5518817520).

Almost surely, 2^66116655321 is an apocalyptic number.

It is an amenable number.

66116655321 is a deficient number, since it is larger than the sum of its proper divisors (22184424999).

66116655321 is a wasteful number, since it uses less digits than its factorization.

66116655321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16036.

The product of its digits is 194400, while the sum is 42.

The spelling of 66116655321 in words is "sixty-six billion, one hundred sixteen million, six hundred fifty-five thousand, three hundred twenty-one".