81002041400125 has 16 divisors (see below), whose sum is σ = 101125882104624. Its totient is φ = 64778982840000.

The previous prime is 81002041400123. The next prime is 81002041400141. The reversal of 81002041400125 is 52100414020018.

It can be written as a sum of positive squares in 8 ways, for example, as 50117946836409 + 30884094563716 = 7079403^2 + 5557346^2 .

It is not a de Polignac number, because 81002041400125 - 2¹ = 81002041400123 is a prime.

It is a super-2 number, since 2×81002041400125² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81002041400093 and 81002041400102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81002041400123) 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, 112892346 + ... + 113607595.

It is an arithmetic number, because the mean of its divisors is an integer number (6320367631539).

Almost surely, 2^{81002041400125} is an apocalyptic number.

It is an amenable number.

81002041400125 is a deficient number, since it is larger than the sum of its proper divisors (20123840704499).

81002041400125 is a wasteful number, since it uses less digits than its factorization.

81002041400125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226502817 (or 226502807 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The spelling of 81002041400125 in words is "eighty-one trillion, two billion, forty-one million, four hundred thousand, one hundred twenty-five".