66423442 has 4 divisors (see below), whose sum is σ = 99635166. Its totient is φ = 33211720.

The previous prime is 66423397. The next prime is 66423463. The reversal of 66423442 is 24432466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 63536841 + 2886601 = 7971^2 + 1699^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16605859 + ... + 16605862.

Almost surely, 2^66423442 is an apocalyptic number.

66423442 is a deficient number, since it is larger than the sum of its proper divisors (33211724).

66423442 is a wasteful number, since it uses less digits than its factorization.

66423442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33211723.

The product of its digits is 27648, while the sum is 31.

The square root of 66423442 is about 8150.0577912061. The cubic root of 66423442 is about 404.9864182815.

The spelling of 66423442 in words is "sixty-six million, four hundred twenty-three thousand, four hundred forty-two".