81135416442 has 16 divisors (see below), whose sum is σ = 165332547360. Its totient is φ = 26534853072.

The previous prime is 81135416419. The next prime is 81135416473. The reversal of 81135416442 is 24461453118.

It is a self number, because there is not a number n which added to its sum of digits gives 81135416442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127571092 + ... + 127571727.

It is an arithmetic number, because the mean of its divisors is an integer number (10333284210).

Almost surely, 2^81135416442 is an apocalyptic number.

81135416442 is an abundant number, since it is smaller than the sum of its proper divisors (84197130918).

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

81135416442 is a wasteful number, since it uses less digits than its factorization.

81135416442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255142877.

The product of its digits is 92160, while the sum is 39.

The spelling of 81135416442 in words is "eighty-one billion, one hundred thirty-five million, four hundred sixteen thousand, four hundred forty-two".