81804536726 has 64 divisors (see below), whose sum is σ = 142145280000. Its totient is φ = 34958689920.

The previous prime is 81804536699. The next prime is 81804536743. The reversal of 81804536726 is 62763540818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5960360 + ... + 5974068.

It is an arithmetic number, because the mean of its divisors is an integer number (2221020000).

Almost surely, 2^81804536726 is an apocalyptic number.

81804536726 is a deficient number, since it is larger than the sum of its proper divisors (60340743274).

81804536726 is a wasteful number, since it uses less digits than its factorization.

81804536726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13997.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 81804536726 in words is "eighty-one billion, eight hundred four million, five hundred thirty-six thousand, seven hundred twenty-six".