81382282650 has 36 divisors (see below), whose sum is σ = 218647067262. Its totient is φ = 21701941920.

The previous prime is 81382282591. The next prime is 81382282673. The reversal of 81382282650 is 5628228318.

81382282650 is a `hidden beast` number, since 8 + 1 + 382 + 2 + 8 + 265 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 69235818129 + 12146464521 = 263127^2 + 110211^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 81382282596 and 81382282605.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 90424309 + ... + 90425208.

Almost surely, 2^81382282650 is an apocalyptic number.

81382282650 is an abundant number, since it is smaller than the sum of its proper divisors (137264784612).

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

81382282650 is a wasteful number, since it uses less digits than its factorization.

81382282650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180849535 (or 180849527 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 81382282650 in words is "eighty-one billion, three hundred eighty-two million, two hundred eighty-two thousand, six hundred fifty".