71878255081 has 2 divisors, whose sum is σ = 71878255082. Its totient is φ = 71878255080.

The previous prime is 71878255079. The next prime is 71878255087. The reversal of 71878255081 is 18055287817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70631035225 + 1247219856 = 265765^2 + 35316^2 .

It is a cyclic number.

It is not a de Polignac number, because 71878255081 - 2¹ = 71878255079 is a prime.

It is a super-2 number, since 2×71878255081² (a number of 23 digits) contains 22 as substring.

Together with 71878255079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (71878255087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35939127540 + 35939127541.

It is an arithmetic number, because the mean of its divisors is an integer number (35939127541).

Almost surely, 2^71878255081 is an apocalyptic number.

It is an amenable number.

71878255081 is a deficient number, since it is larger than the sum of its proper divisors (1).

71878255081 is an equidigital number, since it uses as much as digits as its factorization.

71878255081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1254400, while the sum is 52.

The spelling of 71878255081 in words is "seventy-one billion, eight hundred seventy-eight million, two hundred fifty-five thousand, eighty-one".