81867654051320 has 32 divisors (see below), whose sum is σ = 195037646418000. Its totient is φ = 30820763877888.

The previous prime is 81867654051289. The next prime is 81867654051347. The reversal of 81867654051320 is 2315045676818.

It is a super-2 number, since 2×81867654051320² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 60196803770 + ... + 60196805129.

Almost surely, 2^{81867654051320} is an apocalyptic number.

It is an amenable number.

81867654051320 is an abundant number, since it is smaller than the sum of its proper divisors (113169992366680).

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

81867654051320 is a wasteful number, since it uses less digits than its factorization.

81867654051320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120393608927 (or 120393608923 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 56.

The spelling of 81867654051320 in words is "eighty-one trillion, eight hundred sixty-seven billion, six hundred fifty-four million, fifty-one thousand, three hundred twenty".