81204664932 has 54 divisors (see below), whose sum is σ = 217360767078. Its totient is φ = 25473761664.

The previous prime is 81204664921. The next prime is 81204664967. The reversal of 81204664932 is 23946640218.

81204664932 is a `hidden beast` number, since 81 + 20 + 4 + 66 + 493 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 76427919936 + 4776744996 = 276456^2 + 69114^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 7043869 + ... + 7055387.

Almost surely, 2^81204664932 is an apocalyptic number.

It is an amenable number.

81204664932 is an abundant number, since it is smaller than the sum of its proper divisors (136156102146).

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

81204664932 is a wasteful number, since it uses less digits than its factorization.

81204664932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23065 (or 11541 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 81204664932 in words is "eighty-one billion, two hundred four million, six hundred sixty-four thousand, nine hundred thirty-two".