66218181160 has 32 divisors (see below), whose sum is σ = 153797068800. Its totient is φ = 25632843840.

The previous prime is 66218181157. The next prime is 66218181163. The reversal of 66218181160 is 6118181266.

It is an interprime number because it is at equal distance from previous prime (66218181157) and next prime (66218181163).

It is a super-2 number, since 2×66218181160² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (66218181163) 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 7 ways as a sum of consecutive naturals, for example, 26699640 + ... + 26702119.

It is an arithmetic number, because the mean of its divisors is an integer number (4806158400).

Almost surely, 2^66218181160 is an apocalyptic number.

It is an amenable number.

66218181160 is an abundant number, since it is smaller than the sum of its proper divisors (87578887640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66218181160 is a wasteful number, since it uses less digits than its factorization.

66218181160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53401801 (or 53401797 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The spelling of 66218181160 in words is "sixty-six billion, two hundred eighteen million, one hundred eighty-one thousand, one hundred sixty".