83121355720845 has 48 divisors (see below), whose sum is σ = 155169315904512. Its totient is φ = 40918790010240.

The previous prime is 83121355720817. The next prime is 83121355720913. The reversal of 83121355720845 is 54802755312138.

83121355720845 is a `hidden beast` number, since 8 + 3 + 1 + 2 + 1 + 3 + 557 + 2 + 0 + 84 + 5 = 666.

It is not a de Polignac number, because 83121355720845 - 2³⁵ = 83086995982477 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 83121355720791 and 83121355720800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5301930 + ... + 13941060.

It is an arithmetic number, because the mean of its divisors is an integer number (3232694081344).

Almost surely, 2^{83121355720845} is an apocalyptic number.

It is an amenable number.

83121355720845 is a deficient number, since it is larger than the sum of its proper divisors (72047960183667).

83121355720845 is a wasteful number, since it uses less digits than its factorization.

83121355720845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8655602 (or 8655599 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 54.

The spelling of 83121355720845 in words is "eighty-three trillion, one hundred twenty-one billion, three hundred fifty-five million, seven hundred twenty thousand, eight hundred forty-five".