61105105511 has 2 divisors, whose sum is σ = 61105105512. Its totient is φ = 61105105510.

The previous prime is 61105105493. The next prime is 61105105513. The reversal of 61105105511 is 11550150116.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61105105511 is a prime.

It is a super-2 number, since 2×61105105511² (a number of 22 digits) contains 22 as substring.

Together with 61105105513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61105105513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30552552755 + 30552552756.

It is an arithmetic number, because the mean of its divisors is an integer number (30552552756).

Almost surely, 2^61105105511 is an apocalyptic number.

61105105511 is a deficient number, since it is larger than the sum of its proper divisors (1).

61105105511 is an equidigital number, since it uses as much as digits as its factorization.

61105105511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 750, while the sum is 26.

Adding to 61105105511 its reverse (11550150116), we get a palindrome (72655255627).

The spelling of 61105105511 in words is "sixty-one billion, one hundred five million, one hundred five thousand, five hundred eleven".