82320456628181 has 4 divisors (see below), whose sum is σ = 82463126397612. Its totient is φ = 82177786858752.

The previous prime is 82320456628159. The next prime is 82320456628183. The reversal of 82320456628181 is 18182665402328.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62324945998225 + 19995510629956 = 7894615^2 + 4471634^2 .

It is a cyclic number.

It is not a de Polignac number, because 82320456628181 - 2³⁸ = 82045578721237 is a prime.

It is a super-2 number, since 2×82320456628181² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82320456628183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71334883850 + ... + 71334885003.

It is an arithmetic number, because the mean of its divisors is an integer number (20615781599403).

Almost surely, 2^{82320456628181} is an apocalyptic number.

It is an amenable number.

82320456628181 is a deficient number, since it is larger than the sum of its proper divisors (142669769431).

82320456628181 is a wasteful number, since it uses less digits than its factorization.

82320456628181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142669769430.

The product of its (nonzero) digits is 8847360, while the sum is 56.

The spelling of 82320456628181 in words is "eighty-two trillion, three hundred twenty billion, four hundred fifty-six million, six hundred twenty-eight thousand, one hundred eighty-one".