81441040871 has 8 divisors (see below), whose sum is σ = 86301762624. Its totient is φ = 76588104960.

The previous prime is 81441040777. The next prime is 81441040897. The reversal of 81441040871 is 17804014418.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81441040871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81441060871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1924910 + ... + 1966763.

It is an arithmetic number, because the mean of its divisors is an integer number (10787720328).

Almost surely, 2^81441040871 is an apocalyptic number.

81441040871 is a deficient number, since it is larger than the sum of its proper divisors (4860721753).

81441040871 is a wasteful number, since it uses less digits than its factorization.

81441040871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3892921.

The product of its (nonzero) digits is 28672, while the sum is 38.

The spelling of 81441040871 in words is "eighty-one billion, four hundred forty-one million, forty thousand, eight hundred seventy-one".