81383054250 has 32 divisors (see below), whose sum is σ = 203132105280. Its totient is φ = 21702147600.

The previous prime is 81383054239. The next prime is 81383054287. The reversal of 81383054250 is 5245038318.

It is a junction number, because it is equal to n+sod(n) for n = 81383054199 and 81383054208.

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, 54254620 + ... + 54256119.

It is an arithmetic number, because the mean of its divisors is an integer number (6347878290).

Almost surely, 2^81383054250 is an apocalyptic number.

81383054250 is an abundant number, since it is smaller than the sum of its proper divisors (121749051030).

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

81383054250 is a wasteful number, since it uses less digits than its factorization.

81383054250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108510759 (or 108510749 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 81383054250 in words is "eighty-one billion, three hundred eighty-three million, fifty-four thousand, two hundred fifty".