866880725573 has 2 divisors, whose sum is σ = 866880725574. Its totient is φ = 866880725572.

The previous prime is 866880725449. The next prime is 866880725597. The reversal of 866880725573 is 375527088668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500072436964 + 366808288609 = 707158^2 + 605647^2 .

It is a cyclic number.

It is not a de Polignac number, because 866880725573 - 2³⁶ = 798161248837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866880725273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433440362786 + 433440362787.

It is an arithmetic number, because the mean of its divisors is an integer number (433440362787).

Almost surely, 2^866880725573 is an apocalyptic number.

It is an amenable number.

866880725573 is a deficient number, since it is larger than the sum of its proper divisors (1).

866880725573 is an equidigital number, since it uses as much as digits as its factorization.

866880725573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135475200, while the sum is 65.

The spelling of 866880725573 in words is "eight hundred sixty-six billion, eight hundred eighty million, seven hundred twenty-five thousand, five hundred seventy-three".