6662016181 has 2 divisors, whose sum is σ = 6662016182. Its totient is φ = 6662016180.

The previous prime is 6662016149. The next prime is 6662016191. The reversal of 6662016181 is 1816102666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5695117156 + 966899025 = 75466^2 + 31095^2 .

It is a cyclic number.

It is not a de Polignac number, because 6662016181 - 2⁵ = 6662016149 is a prime.

It is a super-2 number, since 2×6662016181² = 88764919191811649522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6662016181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6662016191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331008090 + 3331008091.

It is an arithmetic number, because the mean of its divisors is an integer number (3331008091).

Almost surely, 2^6662016181 is an apocalyptic number.

It is an amenable number.

6662016181 is a deficient number, since it is larger than the sum of its proper divisors (1).

6662016181 is an equidigital number, since it uses as much as digits as its factorization.

6662016181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 6662016181 is about 81621.1748322701. The cubic root of 6662016181 is about 1881.6343285072.

The spelling of 6662016181 in words is "six billion, six hundred sixty-two million, sixteen thousand, one hundred eighty-one".