866027720651 has 2 divisors, whose sum is σ = 866027720652. Its totient is φ = 866027720650.

The previous prime is 866027720629. The next prime is 866027720711. The reversal of 866027720651 is 156027720668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866027720651 - 2³⁰ = 864953978827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866027720651.

It is not a weakly prime, because it can be changed into another prime (866027720851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433013860325 + 433013860326.

It is an arithmetic number, because the mean of its divisors is an integer number (433013860326).

Almost surely, 2^866027720651 is an apocalyptic number.

866027720651 is a deficient number, since it is larger than the sum of its proper divisors (1).

866027720651 is an equidigital number, since it uses as much as digits as its factorization.

866027720651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 866027720651 in words is "eight hundred sixty-six billion, twenty-seven million, seven hundred twenty thousand, six hundred fifty-one".