82667728245571 has 4 divisors (see below), whose sum is σ = 94477403709232. Its totient is φ = 70858052781912.

The previous prime is 82667728245481. The next prime is 82667728245581. The reversal of 82667728245571 is 17554282776628.

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

It is a cyclic number.

It is not a de Polignac number, because 82667728245571 - 2²¹ = 82667726148419 is a prime.

It is a super-2 number, since 2×82667728245571² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82667728245571.

It is not an unprimeable number, because it can be changed into a prime (82667728245581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5904837731820 + ... + 5904837731833.

It is an arithmetic number, because the mean of its divisors is an integer number (23619350927308).

Almost surely, 2^{82667728245571} is an apocalyptic number.

82667728245571 is a deficient number, since it is larger than the sum of its proper divisors (11809675463661).

82667728245571 is a wasteful number, since it uses less digits than its factorization.

82667728245571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11809675463660.

The product of its digits is 632217600, while the sum is 70.

The spelling of 82667728245571 in words is "eighty-two trillion, six hundred sixty-seven billion, seven hundred twenty-eight million, two hundred forty-five thousand, five hundred seventy-one".