82190742721 has 4 divisors (see below), whose sum is σ = 82265667012. Its totient is φ = 82115818432.

The previous prime is 82190742677. The next prime is 82190742761. The reversal of 82190742721 is 12724709128.

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 23269977025 + 58920765696 = 152545^2 + 242736^2 .

It is a cyclic number.

It is not a de Polignac number, because 82190742721 - 2¹¹ = 82190740673 is a prime.

It is a super-2 number, since 2×82190742721² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82190742761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37460500 + ... + 37462693.

It is an arithmetic number, because the mean of its divisors is an integer number (20566416753).

Almost surely, 2^82190742721 is an apocalyptic number.

It is an amenable number.

82190742721 is a deficient number, since it is larger than the sum of its proper divisors (74924291).

82190742721 is a wasteful number, since it uses less digits than its factorization.

82190742721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74924290.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 82190742721 in words is "eighty-two billion, one hundred ninety million, seven hundred forty-two thousand, seven hundred twenty-one".