81276686555770 has 16 divisors (see below), whose sum is σ = 150252036768648. Its totient is φ = 31632007740480.

The previous prime is 81276686555749. The next prime is 81276686555773. The reversal of 81276686555770 is 7755568667218.

It can be written as a sum of positive squares in 4 ways, for example, as 81254882194201 + 21804361569 = 9014149^2 + 147663^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81276686555693 and 81276686555702.

It is not an unprimeable number, because it can be changed into a prime (81276686555773) 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, 109833359841 + ... + 109833360580.

Almost surely, 2^{81276686555770} is an apocalyptic number.

81276686555770 is a deficient number, since it is larger than the sum of its proper divisors (68975350212878).

81276686555770 is a wasteful number, since it uses less digits than its factorization.

81276686555770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219666720465.

The product of its (nonzero) digits is 1185408000, while the sum is 73.

The spelling of 81276686555770 in words is "eighty-one trillion, two hundred seventy-six billion, six hundred eighty-six million, five hundred fifty-five thousand, seven hundred seventy".