81411811418 has 32 divisors (see below), whose sum is σ = 144426360960. Its totient is φ = 33675808320.

The previous prime is 81411811381. The next prime is 81411811451.

It is a happy number.

81411811418 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1172480 + ... + 1239972.

It is an arithmetic number, because the mean of its divisors is an integer number (4513323780).

Almost surely, 2^81411811418 is an apocalyptic number.

81411811418 is a deficient number, since it is larger than the sum of its proper divisors (63014549542).

81411811418 is a wasteful number, since it uses less digits than its factorization.

81411811418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70502.

The product of its digits is 8192, while the sum is 38.

The spelling of 81411811418 in words is "eighty-one billion, four hundred eleven million, eight hundred eleven thousand, four hundred eighteen".