81471155811 has 8 divisors (see below), whose sum is σ = 114345481920. Its totient is φ = 51455466792.

The previous prime is 81471155803. The next prime is 81471155837. The reversal of 81471155811 is 11855117418.

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

It is not a de Polignac number, because 81471155811 - 2³ = 81471155803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81471155851) 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, 714659205 + ... + 714659318.

It is an arithmetic number, because the mean of its divisors is an integer number (14293185240).

Almost surely, 2^81471155811 is an apocalyptic number.

81471155811 is a deficient number, since it is larger than the sum of its proper divisors (32874326109).

81471155811 is a wasteful number, since it uses less digits than its factorization.

81471155811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429318545.

The product of its digits is 44800, while the sum is 42.

The spelling of 81471155811 in words is "eighty-one billion, four hundred seventy-one million, one hundred fifty-five thousand, eight hundred eleven".