81500200123266 has 48 divisors (see below), whose sum is σ = 185880039040800. Its totient is φ = 25736574429504.

The previous prime is 81500200123259. The next prime is 81500200123319. The reversal of 81500200123266 is 66232100200518.

81500200123266 is a `hidden beast` number, since 8 + 1 + 500 + 2 + 0 + 0 + 123 + 26 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 81500200123266.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25822630 + ... + 28806398.

It is an arithmetic number, because the mean of its divisors is an integer number (3872500813350).

Almost surely, 2^{81500200123266} is an apocalyptic number.

81500200123266 is an abundant number, since it is smaller than the sum of its proper divisors (104379838917534).

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

81500200123266 is a wasteful number, since it uses less digits than its factorization.

81500200123266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3063663 (or 3063660 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 81500200123266 in words is "eighty-one trillion, five hundred billion, two hundred million, one hundred twenty-three thousand, two hundred sixty-six".