8181780194 has 24 divisors (see below), whose sum is σ = 14608387728. Its totient is φ = 3424929480.

The previous prime is 8181780181. The next prime is 8181780197. The reversal of 8181780194 is 4910871818.

It is not an unprimeable number, because it can be changed into a prime (8181780197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 966572 + ... + 974999.

It is an arithmetic number, because the mean of its divisors is an integer number (608682822).

Almost surely, 2^8181780194 is an apocalyptic number.

8181780194 is a deficient number, since it is larger than the sum of its proper divisors (6426607534).

8181780194 is a wasteful number, since it uses less digits than its factorization.

8181780194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941630 (or 1941623 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 47.

The square root of 8181780194 is about 90453.1933875195. The cubic root of 8181780194 is about 2015.0350400596.

The spelling of 8181780194 in words is "eight billion, one hundred eighty-one million, seven hundred eighty thousand, one hundred ninety-four".