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66919 is a prime number
BaseRepresentation
bin10000010101100111
310101210111
4100111213
54120134
61233451
7366046
oct202547
9111714
1066919
1146306
1232887
13245c8
141a55d
1514c64
hex10567

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".