853825906665 has 24 divisors (see below), whose sum is σ = 1481000681160. Its totient is φ = 455055116544.

The previous prime is 853825906643. The next prime is 853825906667. The reversal of 853825906665 is 566609528358.

It can be written as a sum of positive squares in 4 ways, for example, as 35640531369 + 818185375296 = 188787^2 + 904536^2 .

It is not a de Polignac number, because 853825906665 - 2⁶ = 853825906601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (853825906667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6574572 + ... + 6703181.

It is an arithmetic number, because the mean of its divisors is an integer number (61708361715).

Almost surely, 2^853825906665 is an apocalyptic number.

It is an amenable number.

853825906665 is a deficient number, since it is larger than the sum of its proper divisors (627174774495).

853825906665 is a wasteful number, since it uses less digits than its factorization.

853825906665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13279193 (or 13279190 counting only the distinct ones).

The product of its (nonzero) digits is 93312000, while the sum is 63.

The spelling of 853825906665 in words is "eight hundred fifty-three billion, eight hundred twenty-five million, nine hundred six thousand, six hundred sixty-five".