66866351 has 2 divisors, whose sum is σ = 66866352. Its totient is φ = 66866350.

The previous prime is 66866347. The next prime is 66866353. The reversal of 66866351 is 15366866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66866351 - 2² = 66866347 is a prime.

It is a super-2 number, since 2×66866351² = 8942217792110402, which contains 22 as substring.

Together with 66866353, 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 = 66866299 and 66866308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66866353) 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, 33433175 + 33433176.

It is an arithmetic number, because the mean of its divisors is an integer number (33433176).

Almost surely, 2^66866351 is an apocalyptic number.

66866351 is a deficient number, since it is larger than the sum of its proper divisors (1).

66866351 is an equidigital number, since it uses as much as digits as its factorization.

66866351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 41.

The square root of 66866351 is about 8177.1847845087. The cubic root of 66866351 is about 405.8845696585.

The spelling of 66866351 in words is "sixty-six million, eight hundred sixty-six thousand, three hundred fifty-one".