668757851 has 2 divisors, whose sum is σ = 668757852. Its totient is φ = 668757850.

The previous prime is 668757841. The next prime is 668757853. The reversal of 668757851 is 158757866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668757851 - 2¹⁴ = 668741467 is a prime.

Together with 668757853, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 668757793 and 668757802.

It is not a weakly prime, because it can be changed into another prime (668757853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334378925 + 334378926.

It is an arithmetic number, because the mean of its divisors is an integer number (334378926).

Almost surely, 2^668757851 is an apocalyptic number.

668757851 is a deficient number, since it is larger than the sum of its proper divisors (1).

668757851 is an equidigital number, since it uses as much as digits as its factorization.

668757851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 53.

The square root of 668757851 is about 25860.3528784895. The cubic root of 668757851 is about 874.4929202349.

The spelling of 668757851 in words is "six hundred sixty-eight million, seven hundred fifty-seven thousand, eight hundred fifty-one".