81513336426 has 16 divisors (see below), whose sum is σ = 163072937664. Its totient is φ = 27163401344.

The previous prime is 81513336413. The next prime is 81513336427. The reversal of 81513336426 is 62463331518.

It is not an unprimeable number, because it can be changed into a prime (81513336427) 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, 1904775 + ... + 1947098.

It is an arithmetic number, because the mean of its divisors is an integer number (10192058604).

Almost surely, 2^81513336426 is an apocalyptic number.

81513336426 is an abundant number, since it is smaller than the sum of its proper divisors (81559601238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81513336426 is a wasteful number, since it uses less digits than its factorization.

81513336426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855405.

The product of its digits is 311040, while the sum is 42.

The spelling of 81513336426 in words is "eighty-one billion, five hundred thirteen million, three hundred thirty-six thousand, four hundred twenty-six".