81124642118 has 32 divisors (see below), whose sum is σ = 133387720704. Its totient is φ = 36776738592.

The previous prime is 81124642031. The next prime is 81124642139.

It is a happy number.

81124642118 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537371 + ... + 671577.

It is an arithmetic number, because the mean of its divisors is an integer number (4168366272).

Almost surely, 2^81124642118 is an apocalyptic number.

81124642118 is a deficient number, since it is larger than the sum of its proper divisors (52263078586).

81124642118 is a wasteful number, since it uses less digits than its factorization.

81124642118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134636.

The product of its digits is 24576, while the sum is 38.

The spelling of 81124642118 in words is "eighty-one billion, one hundred twenty-four million, six hundred forty-two thousand, one hundred eighteen".