71216221656555 has 24 divisors (see below), whose sum is σ = 123441846119280. Its totient is φ = 37981863268800.

The previous prime is 71216221656497. The next prime is 71216221656577. The reversal of 71216221656555 is 55565612261217.

71216221656555 is a `hidden beast` number, since 7 + 1 + 2 + 1 + 6 + 2 + 21 + 6 + 565 + 55 = 666.

It is not a de Polignac number, because 71216221656555 - 2¹⁰ = 71216221655531 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12680605 + ... + 17413505.

It is an arithmetic number, because the mean of its divisors is an integer number (5143410254970).

Almost surely, 2^{71216221656555} is an apocalyptic number.

71216221656555 is a deficient number, since it is larger than the sum of its proper divisors (52225624462725).

71216221656555 is a wasteful number, since it uses less digits than its factorization.

71216221656555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5067291 (or 5067288 counting only the distinct ones).

The product of its digits is 7560000, while the sum is 54.

The spelling of 71216221656555 in words is "seventy-one trillion, two hundred sixteen billion, two hundred twenty-one million, six hundred fifty-six thousand, five hundred fifty-five".