668055367547 has 2 divisors, whose sum is σ = 668055367548. Its totient is φ = 668055367546.

The previous prime is 668055367541. The next prime is 668055367549. The reversal of 668055367547 is 745763550866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668055367547 - 2²⁶ = 667988258683 is a prime.

Together with 668055367549, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668055367547.

It is not a weakly prime, because it can be changed into another prime (668055367541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334027683773 + 334027683774.

It is an arithmetic number, because the mean of its divisors is an integer number (334027683774).

Almost surely, 2^668055367547 is an apocalyptic number.

668055367547 is a deficient number, since it is larger than the sum of its proper divisors (1).

668055367547 is an equidigital number, since it uses as much as digits as its factorization.

668055367547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008000, while the sum is 62.

The spelling of 668055367547 in words is "six hundred sixty-eight billion, fifty-five million, three hundred sixty-seven thousand, five hundred forty-seven".