71121155505 has 16 divisors (see below), whose sum is σ = 113884263360. Its totient is φ = 37901144768.

The previous prime is 71121155491. The next prime is 71121155527. The reversal of 71121155505 is 50555112117.

It is a cyclic number.

It is not a de Polignac number, because 71121155505 - 2⁸ = 71121155249 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1864122 + ... + 1901891.

It is an arithmetic number, because the mean of its divisors is an integer number (7117766460).

Almost surely, 2^71121155505 is an apocalyptic number.

It is an amenable number.

71121155505 is a deficient number, since it is larger than the sum of its proper divisors (42763107855).

71121155505 is a wasteful number, since it uses less digits than its factorization.

71121155505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3767280.

The product of its (nonzero) digits is 8750, while the sum is 33.

The spelling of 71121155505 in words is "seventy-one billion, one hundred twenty-one million, one hundred fifty-five thousand, five hundred five".