668670853 has 2 divisors, whose sum is σ = 668670854. Its totient is φ = 668670852.

The previous prime is 668670841. The next prime is 668670883. The reversal of 668670853 is 358076866.

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., 581677924 + 86992929 = 24118^2 + 9327^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668670853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668670797 and 668670806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668670823) 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, 334335426 + 334335427.

It is an arithmetic number, because the mean of its divisors is an integer number (334335427).

Almost surely, 2^668670853 is an apocalyptic number.

It is an amenable number.

668670853 is a deficient number, since it is larger than the sum of its proper divisors (1).

668670853 is an equidigital number, since it uses as much as digits as its factorization.

668670853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The square root of 668670853 is about 25858.6707508333. The cubic root of 668670853 is about 874.4549979714.

The spelling of 668670853 in words is "six hundred sixty-eight million, six hundred seventy thousand, eight hundred fifty-three".