616660643 has 4 divisors (see below), whose sum is σ = 616913880. Its totient is φ = 616407408.

The previous prime is 616660621. The next prime is 616660661. The reversal of 616660643 is 346066616.

616660643 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 is a cyclic number.

It is not a de Polignac number, because 616660643 - 2⁶ = 616660579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 616660597 and 616660606.

It is not an unprimeable number, because it can be changed into a prime (616660663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122930 + ... + 127847.

It is an arithmetic number, because the mean of its divisors is an integer number (154228470).

Almost surely, 2^616660643 is an apocalyptic number.

616660643 is a deficient number, since it is larger than the sum of its proper divisors (253237).

616660643 is a wasteful number, since it uses less digits than its factorization.

616660643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253236.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 616660643 is about 24832.6527580120. The cubic root of 616660643 is about 851.1682404622.

The spelling of 616660643 in words is "six hundred sixteen million, six hundred sixty thousand, six hundred forty-three".