61116555111 has 4 divisors (see below), whose sum is σ = 81488740152. Its totient is φ = 40744370072.

The previous prime is 61116555077. The next prime is 61116555127. The reversal of 61116555111 is 11155561116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61116555111 - 2⁶ = 61116555047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61116555011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10186092516 + ... + 10186092521.

It is an arithmetic number, because the mean of its divisors is an integer number (20372185038).

Almost surely, 2^61116555111 is an apocalyptic number.

61116555111 is a deficient number, since it is larger than the sum of its proper divisors (20372185041).

61116555111 is a wasteful number, since it uses less digits than its factorization.

61116555111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20372185040.

The product of its digits is 4500, while the sum is 33.

The spelling of 61116555111 in words is "sixty-one billion, one hundred sixteen million, five hundred fifty-five thousand, one hundred eleven".