866444293537 has 2 divisors, whose sum is σ = 866444293538. Its totient is φ = 866444293536.

The previous prime is 866444293487. The next prime is 866444293597. The reversal of 866444293537 is 735392444668.

866444293537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 639921602401 + 226522691136 = 799951^2 + 475944^2 .

It is a cyclic number.

It is not a de Polignac number, because 866444293537 - 2¹⁹ = 866443769249 is a prime.

It is not a weakly prime, because it can be changed into another prime (866444293597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433222146768 + 433222146769.

It is an arithmetic number, because the mean of its divisors is an integer number (433222146769).

Almost surely, 2^866444293537 is an apocalyptic number.

It is an amenable number.

866444293537 is a deficient number, since it is larger than the sum of its proper divisors (1).

866444293537 is an equidigital number, since it uses as much as digits as its factorization.

866444293537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104509440, while the sum is 61.

The spelling of 866444293537 in words is "eight hundred sixty-six billion, four hundred forty-four million, two hundred ninety-three thousand, five hundred thirty-seven".