81105248554 has 16 divisors (see below), whose sum is σ = 135954697536. Its totient is φ = 35966850400.

The previous prime is 81105248531. The next prime is 81105248597. The reversal of 81105248554 is 45584250118.

It is a super-2 number, since 2×81105248554² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81105248554.

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 7 ways as a sum of consecutive naturals, for example, 44957662 + ... + 44959465.

It is an arithmetic number, because the mean of its divisors is an integer number (8497168596).

Almost surely, 2^81105248554 is an apocalyptic number.

81105248554 is a deficient number, since it is larger than the sum of its proper divisors (54849448982).

81105248554 is a wasteful number, since it uses less digits than its factorization.

81105248554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89917181.

The product of its (nonzero) digits is 256000, while the sum is 43.

The spelling of 81105248554 in words is "eighty-one billion, one hundred five million, two hundred forty-eight thousand, five hundred fifty-four".