81038077071 has 16 divisors (see below), whose sum is σ = 124244185344. Its totient is φ = 46023375744.

The previous prime is 81038077067. The next prime is 81038077103. The reversal of 81038077071 is 17077083018.

It is not a de Polignac number, because 81038077071 - 2² = 81038077067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81038077171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11833866 + ... + 11840711.

It is an arithmetic number, because the mean of its divisors is an integer number (7765261584).

Almost surely, 2^81038077071 is an apocalyptic number.

81038077071 is a deficient number, since it is larger than the sum of its proper divisors (43206108273).

81038077071 is a wasteful number, since it uses less digits than its factorization.

81038077071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23674750.

The product of its (nonzero) digits is 65856, while the sum is 42.

The spelling of 81038077071 in words is "eighty-one billion, thirty-eight million, seventy-seven thousand, seventy-one".