66331751 has 2 divisors, whose sum is σ = 66331752. Its totient is φ = 66331750.

The previous prime is 66331721. The next prime is 66331813. The reversal of 66331751 is 15713366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66331751 - 2⁶ = 66331687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66331721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33165875 + 33165876.

It is an arithmetic number, because the mean of its divisors is an integer number (33165876).

Almost surely, 2^66331751 is an apocalyptic number.

66331751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66331751 is an equidigital number, since it uses as much as digits as its factorization.

66331751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 32.

The square root of 66331751 is about 8144.4306737795. The cubic root of 66331751 is about 404.7999845562.

The spelling of 66331751 in words is "sixty-six million, three hundred thirty-one thousand, seven hundred fifty-one".