81015450126 has 32 divisors (see below), whose sum is σ = 174551932800. Its totient is φ = 24919671264.

The previous prime is 81015450091. The next prime is 81015450143. The reversal of 81015450126 is 62105451018.

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, 72025 + ... + 408923.

It is an arithmetic number, because the mean of its divisors is an integer number (5454747900).

Almost surely, 2^81015450126 is an apocalyptic number.

81015450126 is an abundant number, since it is smaller than the sum of its proper divisors (93536482674).

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

81015450126 is a wasteful number, since it uses less digits than its factorization.

81015450126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340000.

The product of its (nonzero) digits is 9600, while the sum is 33.

The spelling of 81015450126 in words is "eighty-one billion, fifteen million, four hundred fifty thousand, one hundred twenty-six".