611663 has 4 divisors (see below), whose sum is σ = 658728. Its totient is φ = 564600.

The previous prime is 611657. The next prime is 611671. The reversal of 611663 is 366116.

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 611663 - 2¹⁰ = 610639 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 (611603) 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, 23513 + ... + 23538.

It is an arithmetic number, because the mean of its divisors is an integer number (164682).

2⁶¹¹⁶⁶³ is an apocalyptic number.

611663 is a deficient number, since it is larger than the sum of its proper divisors (47065).

611663 is a wasteful number, since it uses less digits than its factorization.

611663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47064.

The product of its digits is 648, while the sum is 23.

The square root of 611663 is about 782.0888696306. The cubic root of 611663 is about 84.8862607906.

Adding to 611663 its reverse (366116), we get a palindrome (977779).

The spelling of 611663 in words is "six hundred eleven thousand, six hundred sixty-three".