66180238081 has 8 divisors (see below), whose sum is σ = 66341583360. Its totient is φ = 66019090032.

The previous prime is 66180238013. The next prime is 66180238087. The reversal of 66180238081 is 18083208166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66180238081 - 2¹¹ = 66180236033 is a prime.

It is a super-2 number, since 2×66180238081² (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 (66180238087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634080 + ... + 731038.

It is an arithmetic number, because the mean of its divisors is an integer number (8292697920).

Almost surely, 2^66180238081 is an apocalyptic number.

It is an amenable number.

66180238081 is a deficient number, since it is larger than the sum of its proper divisors (161345279).

66180238081 is an equidigital number, since it uses as much as digits as its factorization.

66180238081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98615.

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 66180238081 in words is "sixty-six billion, one hundred eighty million, two hundred thirty-eight thousand, eighty-one".