71115388861 has 16 divisors (see below), whose sum is σ = 78874560000. Its totient is φ = 63580504000.

The previous prime is 71115388849. The next prime is 71115388951. The reversal of 71115388861 is 16888351117.

It is a cyclic number.

It is not a de Polignac number, because 71115388861 - 2⁵ = 71115388829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71115388801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49261 + ... + 380338.

It is an arithmetic number, because the mean of its divisors is an integer number (4929660000).

Almost surely, 2^71115388861 is an apocalyptic number.

It is an amenable number.

71115388861 is a deficient number, since it is larger than the sum of its proper divisors (7759171139).

71115388861 is a wasteful number, since it uses less digits than its factorization.

71115388861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429860.

The product of its digits is 322560, while the sum is 49.

The spelling of 71115388861 in words is "seventy-one billion, one hundred fifteen million, three hundred eighty-eight thousand, eight hundred sixty-one".