81351582423 has 8 divisors (see below), whose sum is σ = 108470631936. Its totient is φ = 54233460600.

The previous prime is 81351582421. The next prime is 81351582523. The reversal of 81351582423 is 32428515318.

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

It is not a de Polignac number, because 81351582423 - 2¹ = 81351582421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81351582421) 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, 8218 + ... + 403448.

It is an arithmetic number, because the mean of its divisors is an integer number (13558828992).

Almost surely, 2^81351582423 is an apocalyptic number.

81351582423 is a deficient number, since it is larger than the sum of its proper divisors (27119049513).

81351582423 is a wasteful number, since it uses less digits than its factorization.

81351582423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463845.

The product of its digits is 230400, while the sum is 42.

The spelling of 81351582423 in words is "eighty-one billion, three hundred fifty-one million, five hundred eighty-two thousand, four hundred twenty-three".