66919 has 2 divisors, whose sum is σ = 66920. Its totient is φ = 66918.

The previous prime is 66889. The next prime is 66923. The reversal of 66919 is 91966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66919 - 2⁷ = 66791 is a prime.

It is a super-2 number, since 2×66919² = 8956305122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66949) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33459 + 33460.

It is an arithmetic number, because the mean of its divisors is an integer number (33460).

2⁶⁶⁹¹⁹ is an apocalyptic number.

66919 is a deficient number, since it is larger than the sum of its proper divisors (1).

66919 is an equidigital number, since it uses as much as digits as its factorization.

66919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 66919 is about 258.6870696421. The cubic root of 66919 is about 40.5991069715.

It can be divided in two parts, 6 and 6919, that multiplied together give a palindrome (41514).

The spelling of 66919 in words is "sixty-six thousand, nine hundred nineteen".