66942812 has 6 divisors (see below), whose sum is σ = 117149928. Its totient is φ = 33471404.

The previous prime is 66942781. The next prime is 66942823. The reversal of 66942812 is 21824966.

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, 8367848 + ... + 8367855.

It is an arithmetic number, because the mean of its divisors is an integer number (19524988).

Almost surely, 2^66942812 is an apocalyptic number.

It is an amenable number.

66942812 is a deficient number, since it is larger than the sum of its proper divisors (50207116).

66942812 is a wasteful number, since it uses less digits than its factorization.

66942812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16735707 (or 16735705 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 66942812 is about 8181.8587130309. The cubic root of 66942812 is about 406.0392190349.

The spelling of 66942812 in words is "sixty-six million, nine hundred forty-two thousand, eight hundred twelve".