66743144 has 16 divisors (see below), whose sum is σ = 134770020. Its totient is φ = 30804480.

The previous prime is 66743141. The next prime is 66743167. The reversal of 66743144 is 44134766.

It can be written as a sum of positive squares in 2 ways, for example, as 65448100 + 1295044 = 8090^2 + 1138^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66743141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320777 + ... + 320984.

Almost surely, 2^66743144 is an apocalyptic number.

It is an amenable number.

66743144 is an abundant number, since it is smaller than the sum of its proper divisors (68026876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66743144 is a wasteful number, since it uses less digits than its factorization.

66743144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641780 (or 641776 counting only the distinct ones).

The product of its digits is 48384, while the sum is 35.

The square root of 66743144 is about 8169.6477280235. The cubic root of 66743144 is about 405.6351239833.

The spelling of 66743144 in words is "sixty-six million, seven hundred forty-three thousand, one hundred forty-four".