81000069000018 has 32 divisors (see below), whose sum is σ = 185147721636864. Its totient is φ = 23142288509712.

The previous prime is 81000068999939. The next prime is 81000069000031. The reversal of 81000069000018 is 81000096000018.

It is a super-2 number, since 2×81000069000018² (a number of 29 digits) contains 22 as substring.

81000069000018 is a strobogrammatic number because it is the same when read upside-down.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22841380 + ... + 26148207.

It is an arithmetic number, because the mean of its divisors is an integer number (5785866301152).

Almost surely, 2^{81000069000018} is an apocalyptic number.

81000069000018 is an abundant number, since it is smaller than the sum of its proper divisors (104147652636846).

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

81000069000018 is a wasteful number, since it uses less digits than its factorization.

81000069000018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49028966.

The product of its (nonzero) digits is 3456, while the sum is 33.

Subtracting 81000069000018 from its reverse (81000096000018), we obtain a cube (27000000 = 300³).

The spelling of 81000069000018 in words is "eighty-one trillion, sixty-nine million, eighteen", and thus it is an aban number and an uban number.