66501751 has 2 divisors, whose sum is σ = 66501752. Its totient is φ = 66501750.

The previous prime is 66501683. The next prime is 66501769. The reversal of 66501751 is 15710566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66501751 - 2⁷ = 66501623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66501151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250875 + 33250876.

It is an arithmetic number, because the mean of its divisors is an integer number (33250876).

Almost surely, 2^66501751 is an apocalyptic number.

66501751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66501751 is an equidigital number, since it uses as much as digits as its factorization.

66501751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 66501751 is about 8154.8605751417. The cubic root of 66501751 is about 405.1455068285.

The spelling of 66501751 in words is "sixty-six million, five hundred one thousand, seven hundred fifty-one".