865566001 has 2 divisors, whose sum is σ = 865566002. Its totient is φ = 865566000.

The previous prime is 865565983. The next prime is 865566011. The reversal of 865566001 is 100665568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 718186401 + 147379600 = 26799^2 + 12140^2 .

It is a cyclic number.

It is not a de Polignac number, because 865566001 - 2¹⁹ = 865041713 is a prime.

It is not a weakly prime, because it can be changed into another prime (865566011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432783000 + 432783001.

It is an arithmetic number, because the mean of its divisors is an integer number (432783001).

Almost surely, 2^865566001 is an apocalyptic number.

It is an amenable number.

865566001 is a deficient number, since it is larger than the sum of its proper divisors (1).

865566001 is an equidigital number, since it uses as much as digits as its factorization.

865566001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 865566001 is about 29420.5030718375. The cubic root of 865566001 is about 953.0157171216.

The spelling of 865566001 in words is "eight hundred sixty-five million, five hundred sixty-six thousand, one".