81080578026 has 72 divisors (see below), whose sum is σ = 206231222340. Its totient is φ = 22953321216.

The previous prime is 81080578021. The next prime is 81080578037. The reversal of 81080578026 is 62087508018.

It can be written as a sum of positive squares in 2 ways, for example, as 70625720025 + 10454858001 = 265755^2 + 102249^2 .

It is not an unprimeable number, because it can be changed into a prime (81080578021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 325551 + ... + 517826.

Almost surely, 2^81080578026 is an apocalyptic number.

81080578026 is an abundant number, since it is smaller than the sum of its proper divisors (125150644314).

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

81080578026 is a wasteful number, since it uses less digits than its factorization.

81080578026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843508 (or 843498 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 81080578026 in words is "eighty-one billion, eighty million, five hundred seventy-eight thousand, twenty-six".