866511246616801 has 2 divisors, whose sum is σ = 866511246616802. Its totient is φ = 866511246616800.

The previous prime is 866511246616781. The next prime is 866511246616819. The reversal of 866511246616801 is 108616642115668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 860562818293201 + 5948428323600 = 29335351^2 + 2438940^2 .

It is a cyclic number.

It is not a de Polignac number, because 866511246616801 - 2³⁹ = 865961490802913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866511246616801.

It is not a weakly prime, because it can be changed into another prime (866511246614801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433255623308400 + 433255623308401.

It is an arithmetic number, because the mean of its divisors is an integer number (433255623308401).

Almost surely, 2^{866511246616801} is an apocalyptic number.

It is an amenable number.

866511246616801 is a deficient number, since it is larger than the sum of its proper divisors (1).

866511246616801 is an equidigital number, since it uses as much as digits as its factorization.

866511246616801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19906560, while the sum is 61.

The spelling of 866511246616801 in words is "eight hundred sixty-six trillion, five hundred eleven billion, two hundred forty-six million, six hundred sixteen thousand, eight hundred one".