6667181197 has 2 divisors, whose sum is σ = 6667181198. Its totient is φ = 6667181196.

The previous prime is 6667181173. The next prime is 6667181201. The reversal of 6667181197 is 7911817666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5628150441 + 1039030756 = 75021^2 + 32234^2 .

It is a cyclic number.

It is not a de Polignac number, because 6667181197 - 2³¹ = 4519697549 is a prime.

It is a super-2 number, since 2×6667181197² = 88902610227260705618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6667181107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333590598 + 3333590599.

It is an arithmetic number, because the mean of its divisors is an integer number (3333590599).

Almost surely, 2^6667181197 is an apocalyptic number.

It is an amenable number.

6667181197 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667181197 is an equidigital number, since it uses as much as digits as its factorization.

6667181197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 52.

The square root of 6667181197 is about 81652.8088739144. The cubic root of 6667181197 is about 1882.1204756746.

The spelling of 6667181197 in words is "six billion, six hundred sixty-seven million, one hundred eighty-one thousand, one hundred ninety-seven".