668481763 has 2 divisors, whose sum is σ = 668481764. Its totient is φ = 668481762.

The previous prime is 668481761. The next prime is 668481787. The reversal of 668481763 is 367184866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 668481763 - 2¹ = 668481761 is a prime.

Together with 668481761, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (668481761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334240881 + 334240882.

It is an arithmetic number, because the mean of its divisors is an integer number (334240882).

Almost surely, 2^668481763 is an apocalyptic number.

668481763 is a deficient number, since it is larger than the sum of its proper divisors (1).

668481763 is an equidigital number, since it uses as much as digits as its factorization.

668481763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 49.

The square root of 668481763 is about 25855.0142718970. The cubic root of 668481763 is about 874.3725626528.

The spelling of 668481763 in words is "six hundred sixty-eight million, four hundred eighty-one thousand, seven hundred sixty-three".