66040042 has 8 divisors (see below), whose sum is σ = 101737476. Its totient is φ = 32127552.

The previous prime is 66040033. The next prime is 66040043. The reversal of 66040042 is 24004066.

It can be written as a sum of positive squares in 2 ways, for example, as 65950641 + 89401 = 8121^2 + 299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66040042² = 8722574294723528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66039995 and 66040022.

It is not an unprimeable number, because it can be changed into a prime (66040043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446143 + ... + 446290.

Almost surely, 2^66040042 is an apocalyptic number.

66040042 is a deficient number, since it is larger than the sum of its proper divisors (35697434).

66040042 is a wasteful number, since it uses less digits than its factorization.

66040042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892472.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 66040042 is about 8126.5024457020. The cubic root of 66040042 is about 404.2057124758.

The spelling of 66040042 in words is "sixty-six million, forty thousand, forty-two", and thus it is an eban number.