66144035251243 has 4 divisors (see below), whose sum is σ = 68424864053040. Its totient is φ = 63863206449448.

The previous prime is 66144035251223. The next prime is 66144035251271. The reversal of 66144035251243 is 34215253044166.

66144035251243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66144035251243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66144035251193 and 66144035251202.

It is not an unprimeable number, because it can be changed into a prime (66144035251223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1140414400855 + ... + 1140414400912.

It is an arithmetic number, because the mean of its divisors is an integer number (17106216013260).

Almost surely, 2^{66144035251243} is an apocalyptic number.

66144035251243 is a deficient number, since it is larger than the sum of its proper divisors (2280828801797).

66144035251243 is a wasteful number, since it uses less digits than its factorization.

66144035251243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280828801796.

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 66144035251243 in words is "sixty-six trillion, one hundred forty-four billion, thirty-five million, two hundred fifty-one thousand, two hundred forty-three".