66733747 has 2 divisors, whose sum is σ = 66733748. Its totient is φ = 66733746.

The previous prime is 66733703. The next prime is 66733781. The reversal of 66733747 is 74733766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66733747 - 2¹¹ = 66731699 is a prime.

It is not a weakly prime, because it can be changed into another prime (66833747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33366873 + 33366874.

It is an arithmetic number, because the mean of its divisors is an integer number (33366874).

Almost surely, 2^66733747 is an apocalyptic number.

66733747 is a deficient number, since it is larger than the sum of its proper divisors (1).

66733747 is an equidigital number, since it uses as much as digits as its factorization.

66733747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 444528, while the sum is 43.

The square root of 66733747 is about 8169.0725911819. The cubic root of 66733747 is about 405.6160861619.

The spelling of 66733747 in words is "sixty-six million, seven hundred thirty-three thousand, seven hundred forty-seven".