66240143 has 16 divisors (see below), whose sum is σ = 71559936. Its totient is φ = 61094400.

The previous prime is 66240131. The next prime is 66240173. The reversal of 66240143 is 34104266.

It is a cyclic number.

It is not a de Polignac number, because 66240143 - 2¹⁰ = 66239119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66240173) 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, 296930 + ... + 297152.

It is an arithmetic number, because the mean of its divisors is an integer number (4472496).

Almost surely, 2^66240143 is an apocalyptic number.

66240143 is a deficient number, since it is larger than the sum of its proper divisors (5319793).

66240143 is a wasteful number, since it uses less digits than its factorization.

66240143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 66240143 is about 8138.8047648288. The cubic root of 66240143 is about 404.6135479415.

The spelling of 66240143 in words is "sixty-six million, two hundred forty thousand, one hundred forty-three".