8180781851 has 6 divisors (see below), whose sum is σ = 8924816556. Its totient is φ = 7436801700.

The previous prime is 8180781827. The next prime is 8180781853. The reversal of 8180781851 is 1581870818.

It is a de Polignac number, because none of the positive numbers 2^k-8180781851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8180781796 and 8180781805.

It is not an unprimeable number, because it can be changed into a prime (8180781853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 286346 + ... + 313616.

It is an arithmetic number, because the mean of its divisors is an integer number (1487469426).

Almost surely, 2^8180781851 is an apocalyptic number.

8180781851 is a deficient number, since it is larger than the sum of its proper divisors (744034705).

8180781851 is an frugal number, since it uses more digits than its factorization.

8180781851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54553 (or 27282 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 47.

The square root of 8180781851 is about 90447.6746577821. The cubic root of 8180781851 is about 2014.9530783550.

The spelling of 8180781851 in words is "eight billion, one hundred eighty million, seven hundred eighty-one thousand, eight hundred fifty-one".