66543112144 has 20 divisors (see below), whose sum is σ = 128961603940. Its totient is φ = 33262698240.

The previous prime is 66543112133. The next prime is 66543112157. The reversal of 66543112144 is 44121134566.

It can be written as a sum of positive squares in 2 ways, for example, as 62694150544 + 3848961600 = 250388^2 + 62040^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491427 + ... + 612034.

It is an arithmetic number, because the mean of its divisors is an integer number (6448080197).

Almost surely, 2^66543112144 is an apocalyptic number.

It is an amenable number.

66543112144 is a deficient number, since it is larger than the sum of its proper divisors (62418491796).

66543112144 is a wasteful number, since it uses less digits than its factorization.

66543112144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107238 (or 1107232 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The spelling of 66543112144 in words is "sixty-six billion, five hundred forty-three million, one hundred twelve thousand, one hundred forty-four".