66510001 has 8 divisors (see below), whose sum is σ = 70597224. Its totient is φ = 62442240.

The previous prime is 66509969. The next prime is 66510007. The reversal of 66510001 is 10001566.

It can be written as a sum of positive squares in 4 ways, for example, as 331776 + 66178225 = 576^2 + 8135^2 .

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 66510001 - 2⁵ = 66509969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66510007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2511 + ... + 11803.

It is an arithmetic number, because the mean of its divisors is an integer number (8824653).

Almost surely, 2^66510001 is an apocalyptic number.

It is an amenable number.

66510001 is a deficient number, since it is larger than the sum of its proper divisors (4087223).

66510001 is a wasteful number, since it uses less digits than its factorization.

66510001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9731.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 66510001 is about 8155.3663927502. The cubic root of 66510001 is about 405.1622598321.

Adding to 66510001 its reverse (10001566), we get a palindrome (76511567).

The spelling of 66510001 in words is "sixty-six million, five hundred ten thousand, one".