66800001 has 8 divisors (see below), whose sum is σ = 89354304. Its totient is φ = 44389520.

The previous prime is 66799979. The next prime is 66800003. The reversal of 66800001 is 10000866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66800001 - 2⁵ = 66799969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66800003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34866 + ... + 36731.

It is an arithmetic number, because the mean of its divisors is an integer number (11169288).

Almost surely, 2^66800001 is an apocalyptic number.

It is an amenable number.

66800001 is a deficient number, since it is larger than the sum of its proper divisors (22554303).

66800001 is a wasteful number, since it uses less digits than its factorization.

66800001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71911.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 66800001 is about 8173.1267578571. The cubic root of 66800001 is about 405.7502751382.

Adding to 66800001 its reverse (10000866), we get a palindrome (76800867).

The spelling of 66800001 in words is "sixty-six million, eight hundred thousand, one".