616666 has 4 divisors (see below), whose sum is σ = 925002. Its totient is φ = 308332.

The previous prime is 616643. The next prime is 616669. The reversal of 616666 is 666616.

616666 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 can be written as a sum of positive squares in only one way, i.e., 616225 + 441 = 785^2 + 21^2 .

616666 is a modest number, since divided by 666 gives 616 as remainder.

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 as a sum of consecutive naturals, namely, 154165 + ... + 154168.

2⁶¹⁶⁶⁶⁶ is an apocalyptic number.

616666 is a deficient number, since it is larger than the sum of its proper divisors (308336).

616666 is a wasteful number, since it uses less digits than its factorization.

616666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308335.

The product of its digits is 7776, while the sum is 31.

The square root of 616666 is about 785.2808414828. The cubic root of 616666 is about 85.1170705186.

The spelling of 616666 in words is "six hundred sixteen thousand, six hundred sixty-six".