668448863 has 2 divisors, whose sum is σ = 668448864. Its totient is φ = 668448862.

The previous prime is 668448817. The next prime is 668448881. The reversal of 668448863 is 368844866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668448863 - 2⁸ = 668448607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668445863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334224431 + 334224432.

It is an arithmetic number, because the mean of its divisors is an integer number (334224432).

Almost surely, 2^668448863 is an apocalyptic number.

668448863 is a deficient number, since it is larger than the sum of its proper divisors (1).

668448863 is an equidigital number, since it uses as much as digits as its factorization.

668448863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5308416, while the sum is 53.

The square root of 668448863 is about 25854.3780238473. The cubic root of 668448863 is about 874.3582180435.

The spelling of 668448863 in words is "six hundred sixty-eight million, four hundred forty-eight thousand, eight hundred sixty-three".