616211052561 has 24 divisors (see below), whose sum is σ = 958602776040. Its totient is φ = 379186131456.

The previous prime is 616211052529. The next prime is 616211052571. The reversal of 616211052561 is 165250112616.

616211052561 is a `hidden beast` number, since 6 + 1 + 62 + 1 + 10 + 525 + 61 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 78747584400 + 537463468161 = 280620^2 + 733119^2 .

It is not a de Polignac number, because 616211052561 - 2⁵ = 616211052529 is a prime.

It is a super-2 number, since 2×616211052561² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (616211052571) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2170855 + ... + 2438243.

It is an arithmetic number, because the mean of its divisors is an integer number (39941782335).

Almost surely, 2^616211052561 is an apocalyptic number.

It is an amenable number.

616211052561 is a deficient number, since it is larger than the sum of its proper divisors (342391723479).

616211052561 is a wasteful number, since it uses less digits than its factorization.

616211052561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287105 (or 287102 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 616211052561 in words is "six hundred sixteen billion, two hundred eleven million, fifty-two thousand, five hundred sixty-one".