81326339515 has 16 divisors (see below), whose sum is σ = 105346267200. Its totient is φ = 60086384512.

The previous prime is 81326339513. The next prime is 81326339581. The reversal of 81326339515 is 51593362318.

It is a cyclic number.

It is not a de Polignac number, because 81326339515 - 2¹ = 81326339513 is a prime.

It is a super-2 number, since 2×81326339515² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81326339513) 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, 12189520 + ... + 12196189.

It is an arithmetic number, because the mean of its divisors is an integer number (6584141700).

Almost surely, 2^81326339515 is an apocalyptic number.

81326339515 is a deficient number, since it is larger than the sum of its proper divisors (24019927685).

81326339515 is a wasteful number, since it uses less digits than its factorization.

81326339515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24385766.

The product of its digits is 583200, while the sum is 46.

The spelling of 81326339515 in words is "eighty-one billion, three hundred twenty-six million, three hundred thirty-nine thousand, five hundred fifteen".