82665647353721 has 8 divisors (see below), whose sum is σ = 82723207960800. Its totient is φ = 82608087984480.

The previous prime is 82665647353493. The next prime is 82665647353799. The reversal of 82665647353721 is 12735374656628.

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 82665647353721 - 2²² = 82665643159417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82665647355721) 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, 163331870 + ... + 163837208.

It is an arithmetic number, because the mean of its divisors is an integer number (10340400995100).

Almost surely, 2^{82665647353721} is an apocalyptic number.

It is an amenable number.

82665647353721 is a deficient number, since it is larger than the sum of its proper divisors (57560607079).

82665647353721 is a wasteful number, since it uses less digits than its factorization.

82665647353721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618919.

The product of its digits is 304819200, while the sum is 65.

The spelling of 82665647353721 in words is "eighty-two trillion, six hundred sixty-five billion, six hundred forty-seven million, three hundred fifty-three thousand, seven hundred twenty-one".