61111111011 has 8 divisors (see below), whose sum is σ = 82597666320. Its totient is φ = 40182648192.

The previous prime is 61111111007. The next prime is 61111111027. The reversal of 61111111011 is 11011111116.

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

It is not a de Polignac number, because 61111111011 - 2² = 61111111007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61111111031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139522866 + ... + 139523303.

It is an arithmetic number, because the mean of its divisors is an integer number (10324708290).

Almost surely, 2^61111111011 is an apocalyptic number.

61111111011 is a deficient number, since it is larger than the sum of its proper divisors (21486555309).

61111111011 is a wasteful number, since it uses less digits than its factorization.

61111111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279046245.

The product of its (nonzero) digits is 6, while the sum is 15.

Adding to 61111111011 its reverse (11011111116), we get a palindrome (72122222127).

The spelling of 61111111011 in words is "sixty-one billion, one hundred eleven million, one hundred eleven thousand, eleven".