81316006423 has 16 divisors (see below), whose sum is σ = 83819174400. Its totient is φ = 78852234240.

The previous prime is 81316006393. The next prime is 81316006451. The reversal of 81316006423 is 32460061318.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81316006423 - 2²⁹ = 80779135511 is a prime.

It is a super-2 number, since 2×81316006423² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81316006493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5366568 + ... + 5381698.

It is an arithmetic number, because the mean of its divisors is an integer number (5238698400).

Almost surely, 2^81316006423 is an apocalyptic number.

81316006423 is a deficient number, since it is larger than the sum of its proper divisors (2503167977).

81316006423 is a wasteful number, since it uses less digits than its factorization.

81316006423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16422.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 81316006423 in words is "eighty-one billion, three hundred sixteen million, six thousand, four hundred twenty-three".