81040337671 has 8 divisors (see below), whose sum is σ = 83662745600. Its totient is φ = 78418442520.

The previous prime is 81040337659. The next prime is 81040337683. The reversal of 81040337671 is 17673304018.

It is an interprime number because it is at equal distance from previous prime (81040337659) and next prime (81040337683).

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 81040337671 - 2⁹ = 81040337159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81040337071) 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, 206950 + ... + 452668.

It is an arithmetic number, because the mean of its divisors is an integer number (10457843200).

Almost surely, 2^81040337671 is an apocalyptic number.

81040337671 is a deficient number, since it is larger than the sum of its proper divisors (2622407929).

81040337671 is a wasteful number, since it uses less digits than its factorization.

81040337671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256389.

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 81040337671 in words is "eighty-one billion, forty million, three hundred thirty-seven thousand, six hundred seventy-one".