81840856437062 has 8 divisors (see below), whose sum is σ = 126721326096192. Its totient is φ = 39600414405000.

The previous prime is 81840856437061. The next prime is 81840856437071. The reversal of 81840856437062 is 26073465804818.

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

It is a Harshad number since it is a multiple of its sum of digits (62), and also a Moran number because the ratio is a prime number: 1320013813501 = 81840856437062 / (8 + 1 + 8 + 4 + 0 + 8 + 5 + 6 + 4 + 3 + 7 + 0 + 6 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 81840856436986 and 81840856437004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81840856437061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660006906689 + ... + 660006906812.

It is an arithmetic number, because the mean of its divisors is an integer number (15840165762024).

Almost surely, 2^{81840856437062} is an apocalyptic number.

81840856437062 is a deficient number, since it is larger than the sum of its proper divisors (44880469659130).

81840856437062 is a wasteful number, since it uses less digits than its factorization.

81840856437062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320013813534.

The product of its (nonzero) digits is 61931520, while the sum is 62.

The spelling of 81840856437062 in words is "eighty-one trillion, eight hundred forty billion, eight hundred fifty-six million, four hundred thirty-seven thousand, sixty-two".