66642442 has 8 divisors (see below), whose sum is σ = 100934496. Its totient is φ = 32997612.

The previous prime is 66642437. The next prime is 66642469. The reversal of 66642442 is 24424666.

66642442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 66642398 and 66642407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161548 + ... + 161959.

It is an arithmetic number, because the mean of its divisors is an integer number (12616812).

Almost surely, 2^66642442 is an apocalyptic number.

66642442 is a deficient number, since it is larger than the sum of its proper divisors (34292054).

66642442 is a wasteful number, since it uses less digits than its factorization.

66642442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323612.

The product of its digits is 55296, while the sum is 34.

The square root of 66642442 is about 8163.4822226792. The cubic root of 66642442 is about 405.4310139830.

The spelling of 66642442 in words is "sixty-six million, six hundred forty-two thousand, four hundred forty-two".