820351566875 has 10 divisors (see below), whose sum is σ = 1025111318748. Its totient is φ = 656281253000.

The previous prime is 820351566869. The next prime is 820351566893. The reversal of 820351566875 is 578665153028.

It is a happy number.

It is not a de Polignac number, because 820351566875 - 2³⁸ = 545473659931 is a prime.

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 820351566875.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 656280629 + ... + 656281878.

Almost surely, 2^820351566875 is an apocalyptic number.

820351566875 is a deficient number, since it is larger than the sum of its proper divisors (204759751873).

820351566875 is an equidigital number, since it uses as much as digits as its factorization.

820351566875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312562527 (or 1312562512 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 56.

The spelling of 820351566875 in words is "eight hundred twenty billion, three hundred fifty-one million, five hundred sixty-six thousand, eight hundred seventy-five".