81000099000002 has 24 divisors (see below), whose sum is σ = 152208977244156. Its totient is φ = 32043995208288.

The previous prime is 81000098999999. The next prime is 81000099000043. The reversal of 81000099000002 is 20000099000018.

It can be written as a sum of positive squares in 2 ways, for example, as 72373489722121 + 8626609277881 = 8507261^2 + 2937109^2 .

It is a super-2 number, since 2×81000099000002² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31789676513 + ... + 31789679060.

Almost surely, 2^{81000099000002} is an apocalyptic number.

81000099000002 is a deficient number, since it is larger than the sum of its proper divisors (71208878244154).

81000099000002 is a wasteful number, since it uses less digits than its factorization.

81000099000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63579355602 (or 63579355595 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The spelling of 81000099000002 in words is "eighty-one trillion, ninety-nine million, two", and thus it is an aban number and an uban number.