616965661 has 8 divisors (see below), whose sum is σ = 664891640. Its totient is φ = 569106432.

The previous prime is 616965637. The next prime is 616965667. The reversal of 616965661 is 166569616.

It can be written as a sum of positive squares in 4 ways, for example, as 6579225 + 610386436 = 2565^2 + 24706^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 616965661 - 2⁹ = 616965149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616965667) by changing a digit.

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, 3421 + ... + 35293.

It is an arithmetic number, because the mean of its divisors is an integer number (83111455).

Almost surely, 2^616965661 is an apocalyptic number.

It is an amenable number.

616965661 is a deficient number, since it is larger than the sum of its proper divisors (47925979).

616965661 is a wasteful number, since it uses less digits than its factorization.

616965661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33375.

The product of its digits is 349920, while the sum is 46.

The square root of 616965661 is about 24838.7934690878. The cubic root of 616965661 is about 851.3085547197.

The spelling of 616965661 in words is "six hundred sixteen million, nine hundred sixty-five thousand, six hundred sixty-one".