6667817081 has 2 divisors, whose sum is σ = 6667817082. Its totient is φ = 6667817080.

The previous prime is 6667817069. The next prime is 6667817089. The reversal of 6667817081 is 1807187666.

6667817081 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6655949056 + 11868025 = 81584^2 + 3445^2 .

It is a cyclic number.

It is not a de Polignac number, because 6667817081 - 2¹⁴ = 6667800697 is a prime.

It is a super-2 number, since 2×6667817081² = 88919569251350721122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6667817089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333908540 + 3333908541.

It is an arithmetic number, because the mean of its divisors is an integer number (3333908541).

Almost surely, 2^6667817081 is an apocalyptic number.

It is an amenable number.

6667817081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667817081 is an equidigital number, since it uses as much as digits as its factorization.

6667817081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 6667817081 is about 81656.7026091551. The cubic root of 6667817081 is about 1882.1803096691.

The spelling of 6667817081 in words is "six billion, six hundred sixty-seven million, eight hundred seventeen thousand, eighty-one".