668265745547 has 2 divisors, whose sum is σ = 668265745548. Its totient is φ = 668265745546.

The previous prime is 668265745531. The next prime is 668265745561. The reversal of 668265745547 is 745547562866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668265745547 - 2⁴ = 668265745531 is a prime.

It is not a weakly prime, because it can be changed into another prime (668265645547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334132872773 + 334132872774.

It is an arithmetic number, because the mean of its divisors is an integer number (334132872774).

Almost surely, 2^668265745547 is an apocalyptic number.

668265745547 is a deficient number, since it is larger than the sum of its proper divisors (1).

668265745547 is an equidigital number, since it uses as much as digits as its factorization.

668265745547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688000, while the sum is 65.

The spelling of 668265745547 in words is "six hundred sixty-eight billion, two hundred sixty-five million, seven hundred forty-five thousand, five hundred forty-seven".