81635804322 has 16 divisors (see below), whose sum is σ = 163536237792. Its totient is φ = 27167829920.

The previous prime is 81635804303. The next prime is 81635804323. The reversal of 81635804322 is 22340853618.

It is not an unprimeable number, because it can be changed into a prime (81635804323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11022204 + ... + 11029607.

It is an arithmetic number, because the mean of its divisors is an integer number (10221014862).

Almost surely, 2^81635804322 is an apocalyptic number.

81635804322 is an abundant number, since it is smaller than the sum of its proper divisors (81900433470).

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

81635804322 is a wasteful number, since it uses less digits than its factorization.

81635804322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22052433.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 81635804322 in words is "eighty-one billion, six hundred thirty-five million, eight hundred four thousand, three hundred twenty-two".