660408487 has 2 divisors, whose sum is σ = 660408488. Its totient is φ = 660408486.

The previous prime is 660408473. The next prime is 660408493. The reversal of 660408487 is 784804066.

660408487 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 a de Polignac number, because none of the positive numbers 2^k-660408487 is a prime.

It is a super-2 number, since 2×660408487² = 872278739403258338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660408457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330204243 + 330204244.

It is an arithmetic number, because the mean of its divisors is an integer number (330204244).

Almost surely, 2^660408487 is an apocalyptic number.

660408487 is a deficient number, since it is larger than the sum of its proper divisors (1).

660408487 is an equidigital number, since it uses as much as digits as its factorization.

660408487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 43.

The square root of 660408487 is about 25698.4140950371. The cubic root of 660408487 is about 870.8383546933.

The spelling of 660408487 in words is "six hundred sixty million, four hundred eight thousand, four hundred eighty-seven".