81025271626 has 16 divisors (see below), whose sum is σ = 132045273864. Its totient is φ = 37065337344.

The previous prime is 81025271623. The next prime is 81025271627. The reversal of 81025271626 is 62617252018.

It can be written as a sum of positive squares in 4 ways, for example, as 23485256001 + 57540015625 = 153249^2 + 239875^2 .

It is not an unprimeable number, because it can be changed into a prime (81025271623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13786251 + ... + 13792126.

Almost surely, 2^81025271626 is an apocalyptic number.

81025271626 is a deficient number, since it is larger than the sum of its proper divisors (51020002238).

81025271626 is a wasteful number, since it uses less digits than its factorization.

81025271626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27578505.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 81025271626 in words is "eighty-one billion, twenty-five million, two hundred seventy-one thousand, six hundred twenty-six".