71108663881 has 2 divisors, whose sum is σ = 71108663882. Its totient is φ = 71108663880.

The previous prime is 71108663803. The next prime is 71108663903. The reversal of 71108663881 is 18836680117.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62030385481 + 9078278400 = 249059^2 + 95280^2 .

It is an emirp because it is prime and its reverse (18836680117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71108663881 - 2⁹ = 71108663369 is a prime.

It is a super-2 number, since 2×71108663881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71108963881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35554331940 + 35554331941.

It is an arithmetic number, because the mean of its divisors is an integer number (35554331941).

Almost surely, 2^71108663881 is an apocalyptic number.

It is an amenable number.

71108663881 is a deficient number, since it is larger than the sum of its proper divisors (1).

71108663881 is an equidigital number, since it uses as much as digits as its factorization.

71108663881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 71108663881 in words is "seventy-one billion, one hundred eight million, six hundred sixty-three thousand, eight hundred eighty-one".