71756561711121 has 32 divisors (see below), whose sum is σ = 112378259930880. Its totient is φ = 39867224702976.

The previous prime is 71756561711119. The next prime is 71756561711147. The reversal of 71756561711121 is 12111716565717.

It is not a de Polignac number, because 71756561711121 - 2¹ = 71756561711119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71756561711111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31676956 + ... + 33866541.

It is an arithmetic number, because the mean of its divisors is an integer number (3511820622840).

Almost surely, 2^{71756561711121} is an apocalyptic number.

It is an amenable number.

71756561711121 is a deficient number, since it is larger than the sum of its proper divisors (40621698219759).

71756561711121 is a wasteful number, since it uses less digits than its factorization.

71756561711121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65544953.

The product of its digits is 617400, while the sum is 51.

The spelling of 71756561711121 in words is "seventy-one trillion, seven hundred fifty-six billion, five hundred sixty-one million, seven hundred eleven thousand, one hundred twenty-one".