616801865 has 8 divisors (see below), whose sum is σ = 741770568. Its totient is φ = 492369280.

The previous prime is 616801831. The next prime is 616801919. The reversal of 616801865 is 568108616.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 322624 + 616479241 = 568^2 + 24829^2 .

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

It is not a de Polignac number, because 616801865 - 2²⁰ = 615753289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131492 + ... + 136101.

It is an arithmetic number, because the mean of its divisors is an integer number (92721321).

Almost surely, 2^616801865 is an apocalyptic number.

It is an amenable number.

616801865 is a deficient number, since it is larger than the sum of its proper divisors (124968703).

616801865 is a wasteful number, since it uses less digits than its factorization.

616801865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268059.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 616801865 is about 24835.4960691346. The cubic root of 616801865 is about 851.2332111003.

The spelling of 616801865 in words is "six hundred sixteen million, eight hundred one thousand, eight hundred sixty-five".