8181344475 has 72 divisors (see below), whose sum is σ = 15027444432. Its totient is φ = 4252550400.

The previous prime is 8181344459. The next prime is 8181344531. The reversal of 8181344475 is 5744431818.

It is not a de Polignac number, because 8181344475 - 2⁴ = 8181344459 is a prime.

It is a super-2 number, since 2×8181344475² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 8181344475.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7710445 + ... + 7711505.

It is an arithmetic number, because the mean of its divisors is an integer number (208714506).

Almost surely, 2^8181344475 is an apocalyptic number.

8181344475 is a deficient number, since it is larger than the sum of its proper divisors (6846099957).

8181344475 is a wasteful number, since it uses less digits than its factorization.

8181344475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917 (or 1909 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 8181344475 is about 90450.7848224657. The cubic root of 8181344475 is about 2014.9992693342. Note that the first 3 decimals are identical.

The spelling of 8181344475 in words is "eight billion, one hundred eighty-one million, three hundred forty-four thousand, four hundred seventy-five".