66816001 has 16 divisors (see below), whose sum is σ = 81184896. Its totient is φ = 53680896.

The previous prime is 66815977. The next prime is 66816007. The reversal of 66816001 is 10061866.

It is a cyclic number.

It is not a de Polignac number, because 66816001 - 2⁷ = 66815873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66816007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31950 + ... + 33976.

It is an arithmetic number, because the mean of its divisors is an integer number (5074056).

Almost surely, 2^66816001 is an apocalyptic number.

It is an amenable number.

66816001 is a deficient number, since it is larger than the sum of its proper divisors (14368895).

66816001 is a wasteful number, since it uses less digits than its factorization.

66816001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 66816001 is about 8174.1055168134. The cubic root of 66816001 is about 405.7826677832.

Adding to 66816001 its reverse (10061866), we get a palindrome (76877867).

The spelling of 66816001 in words is "sixty-six million, eight hundred sixteen thousand, one".