8129855266 has 32 divisors (see below), whose sum is σ = 13536920880. Its totient is φ = 3637529856.

The previous prime is 8129855249. The next prime is 8129855267. The reversal of 8129855266 is 6625589218.

It can be written as a sum of positive squares in 8 ways, for example, as 531072025 + 7598783241 = 23045^2 + 87171^2 .

It is a super-2 number, since 2×8129855266² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8129855267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251220 + ... + 281728.

Almost surely, 2^8129855266 is an apocalyptic number.

8129855266 is a deficient number, since it is larger than the sum of its proper divisors (5407065614).

8129855266 is a wasteful number, since it uses less digits than its factorization.

8129855266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30838.

The product of its digits is 2073600, while the sum is 52.

The square root of 8129855266 is about 90165.7100343584. The cubic root of 8129855266 is about 2010.7632445423.

The spelling of 8129855266 in words is "eight billion, one hundred twenty-nine million, eight hundred fifty-five thousand, two hundred sixty-six".