660787207 has 2 divisors, whose sum is σ = 660787208. Its totient is φ = 660787206.

The previous prime is 660787139. The next prime is 660787213. The reversal of 660787207 is 702787066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660787207 - 2¹¹ = 660785159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660787507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330393603 + 330393604.

It is an arithmetic number, because the mean of its divisors is an integer number (330393604).

Almost surely, 2^660787207 is an apocalyptic number.

660787207 is a deficient number, since it is larger than the sum of its proper divisors (1).

660787207 is an equidigital number, since it uses as much as digits as its factorization.

660787207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 660787207 is about 25705.7815870282. The cubic root of 660787207 is about 871.0047874819.

The spelling of 660787207 in words is "six hundred sixty million, seven hundred eighty-seven thousand, two hundred seven".