611256345109 has 2 divisors, whose sum is σ = 611256345110. Its totient is φ = 611256345108.

The previous prime is 611256345107. The next prime is 611256345181. The reversal of 611256345109 is 901543652116.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 611137753009 + 118592100 = 781753^2 + 10890^2 .

It is a cyclic number.

It is not a de Polignac number, because 611256345109 - 2¹ = 611256345107 is a prime.

Together with 611256345107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611256345103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305628172554 + 305628172555.

It is an arithmetic number, because the mean of its divisors is an integer number (305628172555).

Almost surely, 2^611256345109 is an apocalyptic number.

It is an amenable number.

611256345109 is a deficient number, since it is larger than the sum of its proper divisors (1).

611256345109 is an equidigital number, since it uses as much as digits as its factorization.

611256345109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 611256345109 in words is "six hundred eleven billion, two hundred fifty-six million, three hundred forty-five thousand, one hundred nine".