66746831 has 2 divisors, whose sum is σ = 66746832. Its totient is φ = 66746830.

The previous prime is 66746803. The next prime is 66746839. The reversal of 66746831 is 13864766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66746831 - 2¹⁰ = 66745807 is a prime.

It is a super-2 number, since 2×66746831² = 8910278897085122, 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 (66746839) 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, 33373415 + 33373416.

It is an arithmetic number, because the mean of its divisors is an integer number (33373416).

Almost surely, 2^66746831 is an apocalyptic number.

66746831 is a deficient number, since it is larger than the sum of its proper divisors (1).

66746831 is an equidigital number, since it uses as much as digits as its factorization.

66746831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The square root of 66746831 is about 8169.8733772317. The cubic root of 66746831 is about 405.6425931608.

The spelling of 66746831 in words is "sixty-six million, seven hundred forty-six thousand, eight hundred thirty-one".