81786636330 has 256 divisors, whose sum is σ = 240670310400. Its totient is φ = 17384970240.

The previous prime is 81786636329. The next prime is 81786636367. The reversal of 81786636330 is 3363668718.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 26220511 + ... + 26223629.

It is an arithmetic number, because the mean of its divisors is an integer number (940118400).

Almost surely, 2^81786636330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81786636330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120335155200).

81786636330 is an abundant number, since it is smaller than the sum of its proper divisors (158883674070).

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

81786636330 is a wasteful number, since it uses less digits than its factorization.

81786636330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309.

The product of its (nonzero) digits is 2612736, while the sum is 51.

The spelling of 81786636330 in words is "eighty-one billion, seven hundred eighty-six million, six hundred thirty-six thousand, three hundred thirty".