81504567126 has 12 divisors (see below), whose sum is σ = 176593228812. Its totient is φ = 27168189036.

The previous prime is 81504567091. The next prime is 81504567139. The reversal of 81504567126 is 62176540518.

81504567126 is a `hidden beast` number, since 8 + 1 + 504 + 56 + 71 + 26 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2264015736 + ... + 2264015771.

It is an arithmetic number, because the mean of its divisors is an integer number (14716102401).

Almost surely, 2^81504567126 is an apocalyptic number.

81504567126 is an abundant number, since it is smaller than the sum of its proper divisors (95088661686).

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

81504567126 is a wasteful number, since it uses less digits than its factorization.

81504567126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528031515 (or 4528031512 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 81504567126 in words is "eighty-one billion, five hundred four million, five hundred sixty-seven thousand, one hundred twenty-six".