866620397341 has 2 divisors, whose sum is σ = 866620397342. Its totient is φ = 866620397340.

The previous prime is 866620397329. The next prime is 866620397387. The reversal of 866620397341 is 143793026668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501907070116 + 364713327225 = 708454^2 + 603915^2 .

It is a cyclic number.

It is not a de Polignac number, because 866620397341 - 2⁵ = 866620397309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866620397311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433310198670 + 433310198671.

It is an arithmetic number, because the mean of its divisors is an integer number (433310198671).

Almost surely, 2^866620397341 is an apocalyptic number.

It is an amenable number.

866620397341 is a deficient number, since it is larger than the sum of its proper divisors (1).

866620397341 is an equidigital number, since it uses as much as digits as its factorization.

866620397341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7838208, while the sum is 55.

The spelling of 866620397341 in words is "eight hundred sixty-six billion, six hundred twenty million, three hundred ninety-seven thousand, three hundred forty-one".