66941816 has 8 divisors (see below), whose sum is σ = 125515920. Its totient is φ = 33470904.

The previous prime is 66941789. The next prime is 66941821. The reversal of 66941816 is 61814966.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4183856 + ... + 4183871.

It is an arithmetic number, because the mean of its divisors is an integer number (15689490).

Almost surely, 2^66941816 is an apocalyptic number.

It is an amenable number.

66941816 is a deficient number, since it is larger than the sum of its proper divisors (58574104).

66941816 is a wasteful number, since it uses less digits than its factorization.

66941816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8367733 (or 8367729 counting only the distinct ones).

The product of its digits is 62208, while the sum is 41.

The square root of 66941816 is about 8181.7978464394. The cubic root of 66941816 is about 406.0372052908.

The spelling of 66941816 in words is "sixty-six million, nine hundred forty-one thousand, eight hundred sixteen".