611564511109 has 2 divisors, whose sum is σ = 611564511110. Its totient is φ = 611564511108.

The previous prime is 611564511101. The next prime is 611564511121. The reversal of 611564511109 is 901115465116.

611564511109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602103058209 + 9461452900 = 775953^2 + 97270^2 .

It is a cyclic number.

It is not a de Polignac number, because 611564511109 - 2³ = 611564511101 is a prime.

It is a super-2 number, since 2×611564511109² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611564511101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305782255554 + 305782255555.

It is an arithmetic number, because the mean of its divisors is an integer number (305782255555).

Almost surely, 2^611564511109 is an apocalyptic number.

It is an amenable number.

611564511109 is a deficient number, since it is larger than the sum of its proper divisors (1).

611564511109 is an equidigital number, since it uses as much as digits as its factorization.

611564511109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 611564511109 in words is "six hundred eleven billion, five hundred sixty-four million, five hundred eleven thousand, one hundred nine".