81039257850750 has 32 divisors (see below), whose sum is σ = 202273987597344. Its totient is φ = 21610468760000.

The previous prime is 81039257850737. The next prime is 81039257850907. The reversal of 81039257850750 is 5705875293018.

It is a super-2 number, since 2×81039257850750² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

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, 54026171151 + ... + 54026172650.

It is an arithmetic number, because the mean of its divisors is an integer number (6321062112417).

Almost surely, 2^{81039257850750} is an apocalyptic number.

81039257850750 is an abundant number, since it is smaller than the sum of its proper divisors (121234729746594).

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

81039257850750 is a wasteful number, since it uses less digits than its factorization.

81039257850750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108052343821 (or 108052343811 counting only the distinct ones).

The product of its (nonzero) digits is 21168000, while the sum is 60.

The spelling of 81039257850750 in words is "eighty-one trillion, thirty-nine billion, two hundred fifty-seven million, eight hundred fifty thousand, seven hundred fifty".