611221545871 has 2 divisors, whose sum is σ = 611221545872. Its totient is φ = 611221545870.

The previous prime is 611221545859. The next prime is 611221545889. The reversal of 611221545871 is 178545122116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 611221545871 - 2¹⁷ = 611221414799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611221545811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305610772935 + 305610772936.

It is an arithmetic number, because the mean of its divisors is an integer number (305610772936).

Almost surely, 2^611221545871 is an apocalyptic number.

611221545871 is a deficient number, since it is larger than the sum of its proper divisors (1).

611221545871 is an equidigital number, since it uses as much as digits as its factorization.

611221545871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 43.

Adding to 611221545871 its reverse (178545122116), we get a palindrome (789766667987).

The spelling of 611221545871 in words is "six hundred eleven billion, two hundred twenty-one million, five hundred forty-five thousand, eight hundred seventy-one".