8181994275 has 180 divisors, whose sum is σ = 18989482512. Its totient is φ = 3452077440.

The previous prime is 8181994267. The next prime is 8181994313. The reversal of 8181994275 is 5724991818.

It is a happy number.

It is not a de Polignac number, because 8181994275 - 2³ = 8181994267 is a prime.

It is a super-2 number, since 2×8181994275² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 1286754 + ... + 1293096.

Almost surely, 2^8181994275 is an apocalyptic number.

8181994275 is an abundant number, since it is smaller than the sum of its proper divisors (10807488237).

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

8181994275 is a wasteful number, since it uses less digits than its factorization.

8181994275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6392 (or 6371 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 8181994275 is about 90454.3767597787. The cubic root of 8181994275 is about 2015.0526147578.

The spelling of 8181994275 in words is "eight billion, one hundred eighty-one million, nine hundred ninety-four thousand, two hundred seventy-five".