81033750187 has 16 divisors (see below), whose sum is σ = 88885208160. Its totient is φ = 73417420800.

The previous prime is 81033750181. The next prime is 81033750211. The reversal of 81033750187 is 78105733018.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81033750187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81033750181) 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, 409237 + ... + 574057.

It is an arithmetic number, because the mean of its divisors is an integer number (5555325510).

Almost surely, 2^81033750187 is an apocalyptic number.

81033750187 is a deficient number, since it is larger than the sum of its proper divisors (7851457973).

81033750187 is a wasteful number, since it uses less digits than its factorization.

81033750187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165534.

The product of its (nonzero) digits is 141120, while the sum is 43.

The spelling of 81033750187 in words is "eighty-one billion, thirty-three million, seven hundred fifty thousand, one hundred eighty-seven".