6851618181 has 12 divisors (see below), whose sum is σ = 9903117952. Its totient is φ = 4564821096.

The previous prime is 6851618173. The next prime is 6851618209. The reversal of 6851618181 is 1818161586.

It is a happy number.

It is not a de Polignac number, because 6851618181 - 2³ = 6851618173 is a prime.

It is a super-2 number, since 2×6851618181² = 93889343396419497522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6851618131) 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, 228811 + ... + 257016.

Almost surely, 2^6851618181 is an apocalyptic number.

It is an amenable number.

6851618181 is a deficient number, since it is larger than the sum of its proper divisors (3051499771).

6851618181 is a wasteful number, since it uses less digits than its factorization.

6851618181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487400 (or 487397 counting only the distinct ones).

The product of its digits is 92160, while the sum is 45.

The square root of 6851618181 is about 82774.5019978979. The cubic root of 6851618181 is about 1899.3181469300.

The spelling of 6851618181 in words is "six billion, eight hundred fifty-one million, six hundred eighteen thousand, one hundred eighty-one".