660220247 has 2 divisors, whose sum is σ = 660220248. Its totient is φ = 660220246.

The previous prime is 660220201. The next prime is 660220259. The reversal of 660220247 is 742022066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660220247 - 2¹⁰ = 660219223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660220147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330110123 + 330110124.

It is an arithmetic number, because the mean of its divisors is an integer number (330110124).

Almost surely, 2^660220247 is an apocalyptic number.

660220247 is a deficient number, since it is larger than the sum of its proper divisors (1).

660220247 is an equidigital number, since it uses as much as digits as its factorization.

660220247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 660220247 is about 25694.7513512001. The cubic root of 660220247 is about 870.7556068221.

The spelling of 660220247 in words is "six hundred sixty million, two hundred twenty thousand, two hundred forty-seven".