660610001 has 2 divisors, whose sum is σ = 660610002. Its totient is φ = 660610000.

The previous prime is 660609991. The next prime is 660610033. The reversal of 660610001 is 100016066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538286401 + 122323600 = 23201^2 + 11060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660610001 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (600610001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330305000 + 330305001.

It is an arithmetic number, because the mean of its divisors is an integer number (330305001).

Almost surely, 2^660610001 is an apocalyptic number.

It is an amenable number.

660610001 is a deficient number, since it is larger than the sum of its proper divisors (1).

660610001 is an equidigital number, since it uses as much as digits as its factorization.

660610001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 660610001 is about 25702.3345437725. The cubic root of 660610001 is about 870.9269202189.

Adding to 660610001 its reverse (100016066), we get a palindrome (760626067).

The spelling of 660610001 in words is "six hundred sixty million, six hundred ten thousand, one".