820706389375 has 20 divisors (see below), whose sum is σ = 1079531283160. Its totient is φ = 622009044000.

The previous prime is 820706389319. The next prime is 820706389387. The reversal of 820706389375 is 573983607028.

It is not a de Polignac number, because 820706389375 - 2⁹ = 820706388863 is a prime.

It is a super-2 number, since 2×820706389375² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34544184 + ... + 34567933.

It is an arithmetic number, because the mean of its divisors is an integer number (53976564158).

Almost surely, 2^820706389375 is an apocalyptic number.

820706389375 is a deficient number, since it is larger than the sum of its proper divisors (258824893785).

820706389375 is an equidigital number, since it uses as much as digits as its factorization.

820706389375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69112156 (or 69112141 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 58.

The spelling of 820706389375 in words is "eight hundred twenty billion, seven hundred six million, three hundred eighty-nine thousand, three hundred seventy-five".