616566865 has 8 divisors (see below), whose sum is σ = 772049088. Its totient is φ = 471807600.

The previous prime is 616566817. The next prime is 616566869. The reversal of 616566865 is 568665616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 616566865 - 2⁷ = 616566737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616566869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2680611 + ... + 2680840.

It is an arithmetic number, because the mean of its divisors is an integer number (96506136).

Almost surely, 2^616566865 is an apocalyptic number.

It is an amenable number.

616566865 is a deficient number, since it is larger than the sum of its proper divisors (155482223).

616566865 is a wasteful number, since it uses less digits than its factorization.

616566865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5361479.

The product of its digits is 1555200, while the sum is 49.

The square root of 616566865 is about 24830.7644868216. The cubic root of 616566865 is about 851.1250914452.

The spelling of 616566865 in words is "six hundred sixteen million, five hundred sixty-six thousand, eight hundred sixty-five".