81033870281706 has 20 divisors (see below), whose sum is σ = 181575894520482. Its totient is φ = 27011290093848.

The previous prime is 81033870281687. The next prime is 81033870281743. The reversal of 81033870281706 is 60718207833018.

It can be written as a sum of positive squares in only one way, i.e., 55626373139481 + 25407497142225 = 7458309^2 + 5040585^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 250104537745 + ... + 250104538068.

Almost surely, 2^{81033870281706} is an apocalyptic number.

81033870281706 is an abundant number, since it is smaller than the sum of its proper divisors (100542024238776).

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

81033870281706 is a wasteful number, since it uses less digits than its factorization.

81033870281706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500209075827 (or 500209075818 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 81033870281706 in words is "eighty-one trillion, thirty-three billion, eight hundred seventy million, two hundred eighty-one thousand, seven hundred six".