66381080331 has 16 divisors (see below), whose sum is σ = 90475414400. Its totient is φ = 43279904448.

The previous prime is 66381080231. The next prime is 66381080383. The reversal of 66381080331 is 13308018366.

It is not a de Polignac number, because 66381080331 - 2⁷ = 66381080203 is a prime.

It is a super-2 number, since 2×66381080331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66381080331.

It is not an unprimeable number, because it can be changed into a prime (66381080231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160026 + ... + 1215903.

It is an arithmetic number, because the mean of its divisors is an integer number (5654713400).

Almost surely, 2^66381080331 is an apocalyptic number.

66381080331 is a deficient number, since it is larger than the sum of its proper divisors (24094334069).

66381080331 is a wasteful number, since it uses less digits than its factorization.

66381080331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376138.

The product of its (nonzero) digits is 62208, while the sum is 39.

Adding to 66381080331 its reverse (13308018366), we get a palindrome (79689098697).

The spelling of 66381080331 in words is "sixty-six billion, three hundred eighty-one million, eighty thousand, three hundred thirty-one".