663787 has 2 divisors, whose sum is σ = 663788. Its totient is φ = 663786.

The previous prime is 663763. The next prime is 663797. The reversal of 663787 is 787366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663787 - 2⁷ = 663659 is a prime.

It is a super-2 number, since 2×663787² = 881226362738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (663737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331893 + 331894.

It is an arithmetic number, because the mean of its divisors is an integer number (331894).

2⁶⁶³⁷⁸⁷ is an apocalyptic number.

663787 is a deficient number, since it is larger than the sum of its proper divisors (1).

663787 is an equidigital number, since it uses as much as digits as its factorization.

663787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 663787 is about 814.7312440308. The cubic root of 663787 is about 87.2320839068.

It can be divided in two parts, 6637 and 87, that added together give a square (6724 = 82²).

The spelling of 663787 in words is "six hundred sixty-three thousand, seven hundred eighty-seven".