66938968 has 8 divisors (see below), whose sum is σ = 125510580. Its totient is φ = 33469480.

The previous prime is 66938941. The next prime is 66938969. The reversal of 66938968 is 86983966.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66938969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4183678 + ... + 4183693.

Almost surely, 2^66938968 is an apocalyptic number.

It is an amenable number.

66938968 is a deficient number, since it is larger than the sum of its proper divisors (58571612).

66938968 is a wasteful number, since it uses less digits than its factorization.

66938968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8367377 (or 8367373 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 55.

The square root of 66938968 is about 8181.6237997112. The cubic root of 66938968 is about 406.0314470048.

The spelling of 66938968 in words is "sixty-six million, nine hundred thirty-eight thousand, nine hundred sixty-eight".