7666836181 has 2 divisors, whose sum is σ = 7666836182. Its totient is φ = 7666836180.

The previous prime is 7666836143. The next prime is 7666836217. The reversal of 7666836181 is 1816386667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7397548081 + 269288100 = 86009^2 + 16410^2 .

It is a cyclic number.

It is not a de Polignac number, because 7666836181 - 2²⁷ = 7532618453 is a prime.

It is a super-2 number, since 2×7666836181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7666836581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3833418090 + 3833418091.

It is an arithmetic number, because the mean of its divisors is an integer number (3833418091).

Almost surely, 2^7666836181 is an apocalyptic number.

It is an amenable number.

7666836181 is a deficient number, since it is larger than the sum of its proper divisors (1).

7666836181 is an equidigital number, since it uses as much as digits as its factorization.

7666836181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 52.

The square root of 7666836181 is about 87560.4715667978. The cubic root of 7666836181 is about 1971.8417658647.

The spelling of 7666836181 in words is "seven billion, six hundred sixty-six million, eight hundred thirty-six thousand, one hundred eighty-one".