71111111011 has 4 divisors (see below), whose sum is σ = 71119781800. Its totient is φ = 71102440224.

The previous prime is 71111111009. The next prime is 71111111023. The reversal of 71111111011 is 11011111117.

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 71111111011 - 2¹ = 71111111009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71111211011) 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 3 ways as a sum of consecutive naturals, for example, 4323081 + ... + 4339498.

It is an arithmetic number, because the mean of its divisors is an integer number (17779945450).

Almost surely, 2^71111111011 is an apocalyptic number.

71111111011 is a deficient number, since it is larger than the sum of its proper divisors (8670789).

71111111011 is an equidigital number, since it uses as much as digits as its factorization.

71111111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8670788.

The product of its (nonzero) digits is 7, while the sum is 16.

Adding to 71111111011 its reverse (11011111117), we get a palindrome (82122222128).

The spelling of 71111111011 in words is "seventy-one billion, one hundred eleven million, one hundred eleven thousand, eleven".