8181858126 has 64 divisors (see below), whose sum is σ = 18447948288. Its totient is φ = 2400275328.

The previous prime is 8181858121. The next prime is 8181858127. The reversal of 8181858126 is 6218581818.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181858121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 561505 + ... + 575891.

It is an arithmetic number, because the mean of its divisors is an integer number (288249192).

Almost surely, 2^8181858126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8181858126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9223974144).

8181858126 is an abundant number, since it is smaller than the sum of its proper divisors (10266090162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8181858126 is a wasteful number, since it uses less digits than its factorization.

8181858126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14745.

The product of its digits is 245760, while the sum is 48.

The square root of 8181858126 is about 90453.6241728323. The cubic root of 8181858126 is about 2015.0414378202.

The spelling of 8181858126 in words is "eight billion, one hundred eighty-one million, eight hundred fifty-eight thousand, one hundred twenty-six".