66043424 has 12 divisors (see below), whose sum is σ = 130023054. Its totient is φ = 33021696.

The previous prime is 66043391. The next prime is 66043451. The reversal of 66043424 is 42434066.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 63043600 + 2999824 = 7940^2 + 1732^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1031897 + ... + 1031960.

Almost surely, 2^66043424 is an apocalyptic number.

It is an amenable number.

66043424 is a deficient number, since it is larger than the sum of its proper divisors (63979630).

66043424 is a wasteful number, since it uses less digits than its factorization.

66043424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063867 (or 2063859 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 66043424 is about 8126.7105276366. The cubic root of 66043424 is about 404.2126123320.

The spelling of 66043424 in words is "sixty-six million, forty-three thousand, four hundred twenty-four".