66985942 has 4 divisors (see below), whose sum is σ = 100478916. Its totient is φ = 33492970.

The previous prime is 66985909. The next prime is 66985957. The reversal of 66985942 is 24958966.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16746484 + ... + 16746487.

It is an arithmetic number, because the mean of its divisors is an integer number (25119729).

Almost surely, 2^66985942 is an apocalyptic number.

66985942 is a deficient number, since it is larger than the sum of its proper divisors (33492974).

66985942 is a wasteful number, since it uses less digits than its factorization.

66985942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33492973.

The product of its digits is 933120, while the sum is 49.

The square root of 66985942 is about 8184.4939977985. The cubic root of 66985942 is about 406.1264014689.

The spelling of 66985942 in words is "sixty-six million, nine hundred eighty-five thousand, nine hundred forty-two".