66751 has 2 divisors, whose sum is σ = 66752. Its totient is φ = 66750.

The previous prime is 66749. The next prime is 66763. The reversal of 66751 is 15766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66751 - 2¹ = 66749 is a prime.

Together with 66749, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33375 + 33376.

It is an arithmetic number, because the mean of its divisors is an integer number (33376).

2⁶⁶⁷⁵¹ is an apocalyptic number.

66751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66751 is an equidigital number, since it uses as much as digits as its factorization.

66751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 25.

The square root of 66751 is about 258.3621489305. The cubic root of 66751 is about 40.5651038449.

The spelling of 66751 in words is "sixty-six thousand, seven hundred fifty-one".