81456933071 has 8 divisors (see below), whose sum is σ = 82453107600. Its totient is φ = 80462557120.

The previous prime is 81456933067. The next prime is 81456933097. The reversal of 81456933071 is 17033965418.

It is a happy number.

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 81456933071 - 2² = 81456933067 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 (81456933871) 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, 358400 + ... + 539781.

It is an arithmetic number, because the mean of its divisors is an integer number (10306638450).

Almost surely, 2^81456933071 is an apocalyptic number.

81456933071 is a deficient number, since it is larger than the sum of its proper divisors (996174529).

81456933071 is a wasteful number, since it uses less digits than its factorization.

81456933071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899289.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 81456933071 in words is "eighty-one billion, four hundred fifty-six million, nine hundred thirty-three thousand, seventy-one".