616669 has 2 divisors, whose sum is σ = 616670. Its totient is φ = 616668.

The previous prime is 616643. The next prime is 616673. The reversal of 616669 is 966616.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403225 + 213444 = 635^2 + 462^2 .

It is a cyclic number.

It is not a de Polignac number, because 616669 - 2⁹ = 616157 is a prime.

It is a super-2 number, since 2×616669² = 760561311122, which contains 22 as substring.

616669 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616639) 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 as a sum of consecutive naturals, namely, 308334 + 308335.

It is an arithmetic number, because the mean of its divisors is an integer number (308335).

2⁶¹⁶⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

616669 is a deficient number, since it is larger than the sum of its proper divisors (1).

616669 is an equidigital number, since it uses as much as digits as its factorization.

616669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 616669 is about 785.2827516252. The cubic root of 616669 is about 85.1172085462.

The spelling of 616669 in words is "six hundred sixteen thousand, six hundred sixty-nine".