616665 has 24 divisors (see below), whose sum is σ = 1149120. Its totient is φ = 281568.

The previous prime is 616643. The next prime is 616669. The reversal of 616665 is 566616.

616665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 616665 - 2⁷ = 616537 is a prime.

616665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (616669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 316 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2⁶¹⁶⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

616665 is a deficient number, since it is larger than the sum of its proper divisors (532455).

616665 is a wasteful number, since it uses less digits than its factorization.

616665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 854 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 616665 is about 785.2802047677. The cubic root of 616665 is about 85.1170245093.

The spelling of 616665 in words is "six hundred sixteen thousand, six hundred sixty-five".