66943442 has 4 divisors (see below), whose sum is σ = 100415166. Its totient is φ = 33471720.

The previous prime is 66943439. The next prime is 66943493. The reversal of 66943442 is 24434966.

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., 42133081 + 24810361 = 6491^2 + 4981^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66943396 and 66943405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16735859 + ... + 16735862.

Almost surely, 2^66943442 is an apocalyptic number.

66943442 is a deficient number, since it is larger than the sum of its proper divisors (33471724).

66943442 is a wasteful number, since it uses less digits than its factorization.

66943442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33471723.

The product of its digits is 124416, while the sum is 38.

The square root of 66943442 is about 8181.8972127496. The cubic root of 66943442 is about 406.0404927783.

The spelling of 66943442 in words is "sixty-six million, nine hundred forty-three thousand, four hundred forty-two".