820856846883599 has 32 divisors (see below), whose sum is σ = 837922612536576. Its totient is φ = 804013930483200.

The previous prime is 820856846883559. The next prime is 820856846883631. The reversal of 820856846883599 is 995388648658028.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820856846883599 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 (820856846883559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19795403264 + ... + 19795444730.

It is an arithmetic number, because the mean of its divisors is an integer number (26185081641768).

Almost surely, 2^{820856846883599} is an apocalyptic number.

820856846883599 is a deficient number, since it is larger than the sum of its proper divisors (17065765652977).

820856846883599 is a wasteful number, since it uses less digits than its factorization.

820856846883599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47255.

The product of its (nonzero) digits is 57330892800, while the sum is 89.

The spelling of 820856846883599 in words is "eight hundred twenty trillion, eight hundred fifty-six billion, eight hundred forty-six million, eight hundred eighty-three thousand, five hundred ninety-nine".