82704245725821 has 8 divisors (see below), whose sum is σ = 110274942192480. Its totient is φ = 55134856538192.

The previous prime is 82704245725807. The next prime is 82704245725957. The reversal of 82704245725821 is 12852754240728.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82704245725821 - 2⁵ = 82704245725789 is a prime.

It is a super-2 number, since 2×82704245725821² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82704245727821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326672130 + ... + 326925203.

It is an arithmetic number, because the mean of its divisors is an integer number (13784367774060).

Almost surely, 2^{82704245725821} is an apocalyptic number.

It is an amenable number.

82704245725821 is a deficient number, since it is larger than the sum of its proper divisors (27570696466659).

82704245725821 is a wasteful number, since it uses less digits than its factorization.

82704245725821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653639515.

The product of its (nonzero) digits is 20070400, while the sum is 57.

The spelling of 82704245725821 in words is "eighty-two trillion, seven hundred four billion, two hundred forty-five million, seven hundred twenty-five thousand, eight hundred twenty-one".