616646221101 has 6 divisors (see below), whose sum is σ = 890711208270. Its totient is φ = 411097480728.

The previous prime is 616646221067. The next prime is 616646221189. The reversal of 616646221101 is 101122646616.

616646221101 is a `hidden beast` number, since 6 + 1 + 6 + 646 + 2 + 2 + 1 + 1 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 525517705476 + 91128515625 = 724926^2 + 301875^2 .

It is not a de Polignac number, because 616646221101 - 2¹⁰ = 616646220077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616646221001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34258123386 + ... + 34258123403.

It is an arithmetic number, because the mean of its divisors is an integer number (148451868045).

Almost surely, 2^616646221101 is an apocalyptic number.

It is an amenable number.

616646221101 is a deficient number, since it is larger than the sum of its proper divisors (274064987169).

616646221101 is a wasteful number, since it uses less digits than its factorization.

616646221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68516246795 (or 68516246792 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

Adding to 616646221101 its reverse (101122646616), we get a palindrome (717768867717).

The spelling of 616646221101 in words is "six hundred sixteen billion, six hundred forty-six million, two hundred twenty-one thousand, one hundred one".