81126103494840 has 64 divisors (see below), whose sum is σ = 253959976166400. Its totient is φ = 20693035093632.

The previous prime is 81126103494797. The next prime is 81126103494899. The reversal of 81126103494840 is 4849430162118.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14696755120 + ... + 14696760639.

It is an arithmetic number, because the mean of its divisors is an integer number (3968124627600).

Almost surely, 2^{81126103494840} is an apocalyptic number.

It is an amenable number.

81126103494840 is an abundant number, since it is smaller than the sum of its proper divisors (172833872671560).

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

81126103494840 is a wasteful number, since it uses less digits than its factorization.

81126103494840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29393515796 (or 29393515792 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The spelling of 81126103494840 in words is "eighty-one trillion, one hundred twenty-six billion, one hundred three million, four hundred ninety-four thousand, eight hundred forty".