863665001 has 2 divisors, whose sum is σ = 863665002. Its totient is φ = 863665000.

The previous prime is 863664917. The next prime is 863665003. The reversal of 863665001 is 100566368.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 808549225 + 55115776 = 28435^2 + 7424^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-863665001 is a prime.

Together with 863665003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (863665003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431832500 + 431832501.

It is an arithmetic number, because the mean of its divisors is an integer number (431832501).

Almost surely, 2^863665001 is an apocalyptic number.

It is an amenable number.

863665001 is a deficient number, since it is larger than the sum of its proper divisors (1).

863665001 is an equidigital number, since it uses as much as digits as its factorization.

863665001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 863665001 is about 29388.1779122150. The cubic root of 863665001 is about 952.3175185632.

It can be divided in two parts, 8636 and 65001, that added together give a palindrome (73637).

The spelling of 863665001 in words is "eight hundred sixty-three million, six hundred sixty-five thousand, one".