7855808689 has 9 divisors (see below), whose sum is σ = 7992204129. Its totient is φ = 7721706960.

The previous prime is 7855808687. The next prime is 7855808699. The reversal of 7855808689 is 9868085587.

The square root of 7855808689 is 88633.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4431025 + 7851377664 = 2105^2 + 88608^2 .

It is not a de Polignac number, because 7855808689 - 2¹ = 7855808687 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 7855808689.

It is not an unprimeable number, because it can be changed into a prime (7855808683) 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, 5405887 + ... + 5407339.

It is an arithmetic number, because the mean of its divisors is an integer number (888022681).

Almost surely, 2^7855808689 is an apocalyptic number.

7855808689 is the 88633-rd square number.

7855808689 is the 44317-th centered octagonal number.

It is an amenable number.

7855808689 is a deficient number, since it is larger than the sum of its proper divisors (136395440).

7855808689 is an frugal number, since it uses more digits than its factorization.

7855808689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028 (or 1514 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 64.

The cubic root of 7855808689 is about 1987.9111343027.

Multiplying 7855808689 by its sum of digits (64), we get a square (502771756096 = 709064²).

The spelling of 7855808689 in words is "seven billion, eight hundred fifty-five million, eight hundred eight thousand, six hundred eighty-nine".