66268817 has 2 divisors, whose sum is σ = 66268818. Its totient is φ = 66268816.

The previous prime is 66268801. The next prime is 66268831. The reversal of 66268817 is 71886266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50140561 + 16128256 = 7081^2 + 4016^2 .

It is a cyclic number.

It is not a de Polignac number, because 66268817 - 2⁴ = 66268801 is a prime.

It is a super-2 number, since 2×66268817² = 8783112213158978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66268877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33134408 + 33134409.

It is an arithmetic number, because the mean of its divisors is an integer number (33134409).

Almost surely, 2^66268817 is an apocalyptic number.

It is an amenable number.

66268817 is a deficient number, since it is larger than the sum of its proper divisors (1).

66268817 is an equidigital number, since it uses as much as digits as its factorization.

66268817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 66268817 is about 8140.5661351039. The cubic root of 66268817 is about 404.6719224894.

The spelling of 66268817 in words is "sixty-six million, two hundred sixty-eight thousand, eight hundred seventeen".