668851793 has 2 divisors, whose sum is σ = 668851794. Its totient is φ = 668851792.

The previous prime is 668851787. The next prime is 668851873. The reversal of 668851793 is 397158866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666052864 + 2798929 = 25808^2 + 1673^2 .

It is a cyclic number.

It is not a de Polignac number, because 668851793 - 2²⁸ = 400416337 is a prime.

It is not a weakly prime, because it can be changed into another prime (668851193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334425896 + 334425897.

It is an arithmetic number, because the mean of its divisors is an integer number (334425897).

Almost surely, 2^668851793 is an apocalyptic number.

It is an amenable number.

668851793 is a deficient number, since it is larger than the sum of its proper divisors (1).

668851793 is an equidigital number, since it uses as much as digits as its factorization.

668851793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 53.

The square root of 668851793 is about 25862.1691472313. The cubic root of 668851793 is about 874.5338656819.

The spelling of 668851793 in words is "six hundred sixty-eight million, eight hundred fifty-one thousand, seven hundred ninety-three".