616663 has 4 divisors (see below), whose sum is σ = 631048. Its totient is φ = 602280.

The previous prime is 616643. The next prime is 616669. The reversal of 616663 is 366616.

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 616663 - 2¹³ = 608471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616669) 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 3 ways as a sum of consecutive naturals, for example, 7128 + ... + 7213.

It is an arithmetic number, because the mean of its divisors is an integer number (157762).

2⁶¹⁶⁶⁶³ is an apocalyptic number.

616663 is a deficient number, since it is larger than the sum of its proper divisors (14385).

616663 is a wasteful number, since it uses less digits than its factorization.

616663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14384.

The product of its digits is 3888, while the sum is 28.

The square root of 616663 is about 785.2789313359. The cubic root of 616663 is about 85.1169324906.

Subtracting from 616663 its reverse (366616), we obtain a cube (250047 = 63³).

It can be divided in two parts, 61 and 6663, that added together give a square (6724 = 82²).

The spelling of 616663 in words is "six hundred sixteen thousand, six hundred sixty-three".