864825543122 has 6 divisors (see below), whose sum is σ = 1297240287429. Its totient is φ = 432412113980.

The previous prime is 864825543121. The next prime is 864825543139. The reversal of 864825543122 is 221345528468.

It can be written as a sum of positive squares in 2 ways, for example, as 766410951601 + 98414591521 = 875449^2 + 313711^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=657581.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864825543121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 986372 + ... + 1643952.

Almost surely, 2^864825543122 is an apocalyptic number.

864825543122 is a deficient number, since it is larger than the sum of its proper divisors (432414744307).

864825543122 is an frugal number, since it uses more digits than its factorization.

864825543122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315164 (or 657583 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 50.

Multiplying 864825543122 by its sum of digits (50), we get a square (43241277156100 = 6575810²).

The spelling of 864825543122 in words is "eight hundred sixty-four billion, eight hundred twenty-five million, five hundred forty-three thousand, one hundred twenty-two".