668014813457 has 2 divisors, whose sum is σ = 668014813458. Its totient is φ = 668014813456.

The previous prime is 668014813387. The next prime is 668014813489. The reversal of 668014813457 is 754318410866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658319654161 + 9695159296 = 811369^2 + 98464^2 .

It is a cyclic number.

It is not a de Polignac number, because 668014813457 - 2¹⁸ = 668014551313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668014813399 and 668014813408.

It is not a weakly prime, because it can be changed into another prime (668014813957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334007406728 + 334007406729.

It is an arithmetic number, because the mean of its divisors is an integer number (334007406729).

Almost surely, 2^668014813457 is an apocalyptic number.

It is an amenable number.

668014813457 is a deficient number, since it is larger than the sum of its proper divisors (1).

668014813457 is an equidigital number, since it uses as much as digits as its factorization.

668014813457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 668014813457 in words is "six hundred sixty-eight billion, fourteen million, eight hundred thirteen thousand, four hundred fifty-seven".