7855312269289 has 9 divisors (see below), whose sum is σ = 7932609397629. Its totient is φ = 7778761222860.

The previous prime is 7855312269229. The next prime is 7855312269293. The reversal of 7855312269289 is 9829622135587.

The square root of 7855312269289 is 2802733.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 7855312269289 - 2²³ = 7855303880681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7855312269209) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 288667894 + ... + 288695104.

It is an arithmetic number, because the mean of its divisors is an integer number (881401044181).

Almost surely, 2^{7855312269289} is an apocalyptic number.

7855312269289 is the 2802733-rd square number.

7855312269289 is the 1401367-th centered octagonal number.

It is an amenable number.

7855312269289 is a deficient number, since it is larger than the sum of its proper divisors (77297128340).

7855312269289 is an frugal number, since it uses more digits than its factorization.

7855312269289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54628 (or 27314 counting only the distinct ones).

The product of its digits is 130636800, while the sum is 67.

The spelling of 7855312269289 in words is "seven trillion, eight hundred fifty-five billion, three hundred twelve million, two hundred sixty-nine thousand, two hundred eighty-nine".