663919 has 4 divisors (see below), whose sum is σ = 670120. Its totient is φ = 657720.

The previous prime is 663907. The next prime is 663937. The reversal of 663919 is 919366.

663919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 663919 - 2⁹ = 663407 is a prime.

It is a super-2 number, since 2×663919² = 881576877122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2937 + ... + 3154.

It is an arithmetic number, because the mean of its divisors is an integer number (167530).

2⁶⁶³⁹¹⁹ is an apocalyptic number.

663919 is a deficient number, since it is larger than the sum of its proper divisors (6201).

663919 is a wasteful number, since it uses less digits than its factorization.

663919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6200.

The product of its digits is 8748, while the sum is 34.

The square root of 663919 is about 814.8122483125. The cubic root of 663919 is about 87.2378658177.

The spelling of 663919 in words is "six hundred sixty-three thousand, nine hundred nineteen".