660331747 has 2 divisors, whose sum is σ = 660331748. Its totient is φ = 660331746.

The previous prime is 660331741. The next prime is 660331751. The reversal of 660331747 is 747133066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660331747 - 2⁷ = 660331619 is a prime.

It is not a weakly prime, because it can be changed into another prime (660331741) 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, 330165873 + 330165874.

It is an arithmetic number, because the mean of its divisors is an integer number (330165874).

Almost surely, 2^660331747 is an apocalyptic number.

660331747 is a deficient number, since it is larger than the sum of its proper divisors (1).

660331747 is an equidigital number, since it uses as much as digits as its factorization.

660331747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 37.

The square root of 660331747 is about 25696.9209634151. The cubic root of 660331747 is about 870.8046226798.

The spelling of 660331747 in words is "six hundred sixty million, three hundred thirty-one thousand, seven hundred forty-seven".