611139688944221 has 2 divisors, whose sum is σ = 611139688944222. Its totient is φ = 611139688944220.

The previous prime is 611139688944217. The next prime is 611139688944247. The reversal of 611139688944221 is 122449886931116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 583917695743321 + 27221993200900 = 24164389^2 + 5217470^2 .

It is a cyclic number.

It is not a de Polignac number, because 611139688944221 - 2² = 611139688944217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611139688944721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305569844472110 + 305569844472111.

It is an arithmetic number, because the mean of its divisors is an integer number (305569844472111).

Almost surely, 2^{611139688944221} is an apocalyptic number.

It is an amenable number.

611139688944221 is a deficient number, since it is larger than the sum of its proper divisors (1).

611139688944221 is an equidigital number, since it uses as much as digits as its factorization.

611139688944221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35831808, while the sum is 65.

The spelling of 611139688944221 in words is "six hundred eleven trillion, one hundred thirty-nine billion, six hundred eighty-eight million, nine hundred forty-four thousand, two hundred twenty-one".