827064870821 has 4 divisors (see below), whose sum is σ = 945216995232. Its totient is φ = 708912746412.

The previous prime is 827064870757. The next prime is 827064870833. The reversal of 827064870821 is 128078460728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 827064870821 - 2⁶ = 827064870757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (827064860821) 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, 59076062195 + ... + 59076062208.

It is an arithmetic number, because the mean of its divisors is an integer number (236304248808).

Almost surely, 2^827064870821 is an apocalyptic number.

It is an amenable number.

827064870821 is a deficient number, since it is larger than the sum of its proper divisors (118152124411).

827064870821 is a wasteful number, since it uses less digits than its factorization.

827064870821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118152124410.

The product of its (nonzero) digits is 2408448, while the sum is 53.

The spelling of 827064870821 in words is "eight hundred twenty-seven billion, sixty-four million, eight hundred seventy thousand, eight hundred twenty-one".