6667017391 has 2 divisors, whose sum is σ = 6667017392. Its totient is φ = 6667017390.

The previous prime is 6667017389. The next prime is 6667017439. The reversal of 6667017391 is 1937107666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6667017391 - 2¹ = 6667017389 is a prime.

Together with 6667017389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6667017341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333508695 + 3333508696.

It is an arithmetic number, because the mean of its divisors is an integer number (3333508696).

Almost surely, 2^6667017391 is an apocalyptic number.

6667017391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667017391 is an equidigital number, since it uses as much as digits as its factorization.

6667017391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 6667017391 is about 81651.8058036685. The cubic root of 6667017391 is about 1882.1050616067.

The spelling of 6667017391 in words is "six billion, six hundred sixty-seven million, seventeen thousand, three hundred ninety-one".