668248747 has 2 divisors, whose sum is σ = 668248748. Its totient is φ = 668248746.

The previous prime is 668248697. The next prime is 668248771. The reversal of 668248747 is 747842866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668248747 - 2⁷ = 668248619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668248694 and 668248703.

It is not a weakly prime, because it can be changed into another prime (668228747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334124373 + 334124374.

It is an arithmetic number, because the mean of its divisors is an integer number (334124374).

Almost surely, 2^668248747 is an apocalyptic number.

668248747 is a deficient number, since it is larger than the sum of its proper divisors (1).

668248747 is an equidigital number, since it uses as much as digits as its factorization.

668248747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3612672, while the sum is 52.

The square root of 668248747 is about 25850.5076739317. The cubic root of 668248747 is about 874.2709560541.

The spelling of 668248747 in words is "six hundred sixty-eight million, two hundred forty-eight thousand, seven hundred forty-seven".