663147 has 12 divisors (see below), whose sum is σ = 993720. Its totient is φ = 441936.

The previous prime is 663127. The next prime is 663149. The reversal of 663147 is 741366.

It is not a de Polignac number, because 663147 - 2¹¹ = 661099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 663147.

It is not an unprimeable number, because it can be changed into a prime (663149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1122 + ... + 1607.

It is an arithmetic number, because the mean of its divisors is an integer number (82810).

2⁶⁶³¹⁴⁷ is an apocalyptic number.

663147 is a deficient number, since it is larger than the sum of its proper divisors (330573).

663147 is an equidigital number, since it uses as much as digits as its factorization.

663147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744 (or 2732 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 663147 is about 814.3383817554. The cubic root of 663147 is about 87.2040395261.

It can be divided in two parts, 663 and 147, that multiplied together give a triangular number (97461 = T₄₄₁).

The spelling of 663147 in words is "six hundred sixty-three thousand, one hundred forty-seven".