81835205922 has 18 divisors (see below), whose sum is σ = 177312242523. Its totient is φ = 27277997412.

The previous prime is 81835205909. The next prime is 81835205939. The reversal of 81835205922 is 22950253818.

81835205922 is a `hidden beast` number, since 8 + 1 + 8 + 3 + 52 + 0 + 592 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40917602961 + 40917602961 = 202281^2 + 202281^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=202281.

It is a super-2 number, since 2×81835205922² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1179973 + ... + 1247399.

Almost surely, 2^81835205922 is an apocalyptic number.

81835205922 is an abundant number, since it is smaller than the sum of its proper divisors (95477036601).

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

81835205922 is an frugal number, since it uses more digits than its factorization.

81835205922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134862 (or 67432 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 81835205922 in words is "eighty-one billion, eight hundred thirty-five million, two hundred five thousand, nine hundred twenty-two".