81203651934336 has 96 divisors (see below), whose sum is σ = 234977397735600. Its totient is φ = 26916666680832.

The previous prime is 81203651934329. The next prime is 81203651934337. The reversal of 81203651934336 is 63343915630218.

81203651934336 is a `hidden beast` number, since 8 + 1 + 20 + 36 + 519 + 3 + 43 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (81203651934337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196691226 + ... + 197103641.

Almost surely, 2^{81203651934336} is an apocalyptic number.

It is an amenable number.

81203651934336 is an abundant number, since it is smaller than the sum of its proper divisors (153773745801264).

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

81203651934336 is a wasteful number, since it uses less digits than its factorization.

81203651934336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393795066 (or 393795051 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 54.

The spelling of 81203651934336 in words is "eighty-one trillion, two hundred three billion, six hundred fifty-one million, nine hundred thirty-four thousand, three hundred thirty-six".