81430054650 has 576 divisors, whose sum is σ = 279146419200. Its totient is φ = 17351832960.

The previous prime is 81430054597. The next prime is 81430054661. The reversal of 81430054650 is 5645003418.

It is a happy number.

81430054650 is a `hidden beast` number, since 81 + 4 + 30 + 0 + 546 + 5 + 0 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 84208467 + ... + 84209433.

It is an arithmetic number, because the mean of its divisors is an integer number (484629200).

Almost surely, 2^81430054650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81430054650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139573209600).

81430054650 is an abundant number, since it is smaller than the sum of its proper divisors (197716364550).

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

81430054650 is a wasteful number, since it uses less digits than its factorization.

81430054650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 81430054650 in words is "eighty-one billion, four hundred thirty million, fifty-four thousand, six hundred fifty".