81081545071 has 8 divisors (see below), whose sum is σ = 81169833600. Its totient is φ = 80993307648.

The previous prime is 81081545029. The next prime is 81081545093. The reversal of 81081545071 is 17054518018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81081545071 - 2⁹ = 81081544559 is a prime.

It is a super-2 number, since 2×81081545071² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81081545771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3734455 + ... + 3756103.

It is an arithmetic number, because the mean of its divisors is an integer number (10146229200).

Almost surely, 2^81081545071 is an apocalyptic number.

81081545071 is a deficient number, since it is larger than the sum of its proper divisors (88288529).

81081545071 is a wasteful number, since it uses less digits than its factorization.

81081545071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25553.

The product of its (nonzero) digits is 44800, while the sum is 40.

The spelling of 81081545071 in words is "eighty-one billion, eighty-one million, five hundred forty-five thousand, seventy-one".