821256263875 has 8 divisors (see below), whose sum is σ = 1024927817472. Its totient is φ = 657005011000.

The previous prime is 821256263873. The next prime is 821256263899. The reversal of 821256263875 is 578362652128.

821256263875 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 821256263875 - 2¹ = 821256263873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821256263873) 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, 3285024931 + ... + 3285025180.

It is an arithmetic number, because the mean of its divisors is an integer number (128115977184).

Almost surely, 2^821256263875 is an apocalyptic number.

821256263875 is a deficient number, since it is larger than the sum of its proper divisors (203671553597).

821256263875 is an equidigital number, since it uses as much as digits as its factorization.

821256263875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570050126 (or 6570050116 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 55.

The spelling of 821256263875 in words is "eight hundred twenty-one billion, two hundred fifty-six million, two hundred sixty-three thousand, eight hundred seventy-five".