8255661181 has 4 divisors (see below), whose sum is σ = 8521972864. Its totient is φ = 7989349500.

The previous prime is 8255661179. The next prime is 8255661209. The reversal of 8255661181 is 1811665528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8255661181 - 2¹ = 8255661179 is a prime.

It is a super-2 number, since 2×8255661181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8255661121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133155795 + ... + 133155856.

It is an arithmetic number, because the mean of its divisors is an integer number (2130493216).

Almost surely, 2^8255661181 is an apocalyptic number.

It is an amenable number.

8255661181 is a deficient number, since it is larger than the sum of its proper divisors (266311683).

8255661181 is a wasteful number, since it uses less digits than its factorization.

8255661181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266311682.

The product of its digits is 115200, while the sum is 43.

The square root of 8255661181 is about 90860.6690543274. The cubic root of 8255661181 is about 2021.0820903148.

The spelling of 8255661181 in words is "eight billion, two hundred fifty-five million, six hundred sixty-one thousand, one hundred eighty-one".