81920406526 has 32 divisors (see below), whose sum is σ = 140779560960. Its totient is φ = 35022715200.

The previous prime is 81920406493. The next prime is 81920406527. The reversal of 81920406526 is 62560402918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81920406527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10554235 + ... + 10561993.

It is an arithmetic number, because the mean of its divisors is an integer number (4399361280).

Almost surely, 2^81920406526 is an apocalyptic number.

81920406526 is a deficient number, since it is larger than the sum of its proper divisors (58859154434).

81920406526 is a wasteful number, since it uses less digits than its factorization.

81920406526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9520.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 81920406526 in words is "eighty-one billion, nine hundred twenty million, four hundred six thousand, five hundred twenty-six".