660455687 has 2 divisors, whose sum is σ = 660455688. Its totient is φ = 660455686.

The previous prime is 660455683. The next prime is 660455689. The reversal of 660455687 is 786554066.

660455687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660455687 - 2² = 660455683 is a prime.

Together with 660455689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660455683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330227843 + 330227844.

It is an arithmetic number, because the mean of its divisors is an integer number (330227844).

Almost surely, 2^660455687 is an apocalyptic number.

660455687 is a deficient number, since it is larger than the sum of its proper divisors (1).

660455687 is an equidigital number, since it uses as much as digits as its factorization.

660455687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The square root of 660455687 is about 25699.3324232362. The cubic root of 660455687 is about 870.8591007376.

The spelling of 660455687 in words is "six hundred sixty million, four hundred fifty-five thousand, six hundred eighty-seven".