61111111111 has 8 divisors (see below), whose sum is σ = 64615953920. Its totient is φ = 57635115192.

The previous prime is 61111111091. The next prime is 61111111121. The reversal of 61111111111 is 11111111116.

61111111111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61111111111 - 2²⁵ = 61077556679 is a prime.

61111111111 is a modest number, since divided by 111111 gives 61111 as remainder.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61111111121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7207365 + ... + 7215838.

It is an arithmetic number, because the mean of its divisors is an integer number (8076994240).

Almost surely, 2^61111111111 is an apocalyptic number.

61111111111 is a deficient number, since it is larger than the sum of its proper divisors (3504842809).

61111111111 is a wasteful number, since it uses less digits than its factorization.

61111111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14423445.

The product of its digits is 6, while the sum is 16.

Adding to 61111111111 its reverse (11111111116), we get a palindrome (72222222227).

It can be divided in two parts, 6 and 1111111111, that multiplied together give a palindrome (6666666666).

The spelling of 61111111111 in words is "sixty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".