61111111168 has 40 divisors (see below), whose sum is σ = 128529351720. Its totient is φ = 28947363840.

The previous prime is 61111111147. The next prime is 61111111169. The reversal of 61111111168 is 86111111116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61111111169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3131263 + ... + 3150718.

It is an arithmetic number, because the mean of its divisors is an integer number (3213233793).

Almost surely, 2^61111111168 is an apocalyptic number.

It is an amenable number.

61111111168 is an abundant number, since it is smaller than the sum of its proper divisors (67418240552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61111111168 is an equidigital number, since it uses as much as digits as its factorization.

61111111168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6282018 (or 6282002 counting only the distinct ones).

The product of its digits is 288, while the sum is 28.

The spelling of 61111111168 in words is "sixty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred sixty-eight".