81684872361356 has 24 divisors (see below), whose sum is σ = 156079332864000. Its totient is φ = 37097228954000.

The previous prime is 81684872361343. The next prime is 81684872361409. The reversal of 81684872361356 is 65316327848618.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 806410856 + ... + 806512143.

It is an arithmetic number, because the mean of its divisors is an integer number (6503305536000).

Almost surely, 2^{81684872361356} is an apocalyptic number.

It is an amenable number.

81684872361356 is a deficient number, since it is larger than the sum of its proper divisors (74394460502644).

81684872361356 is a wasteful number, since it uses less digits than its factorization.

81684872361356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612924165 (or 1612924163 counting only the distinct ones).

The product of its digits is 278691840, while the sum is 68.

The spelling of 81684872361356 in words is "eighty-one trillion, six hundred eighty-four billion, eight hundred seventy-two million, three hundred sixty-one thousand, three hundred fifty-six".