616553361 has 12 divisors (see below), whose sum is σ = 895193988. Its totient is φ = 408904704.

The previous prime is 616553359. The next prime is 616553411. The reversal of 616553361 is 163355616.

616553361 is a `hidden beast` number, since 6 + 1 + 65 + 533 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 396209025 + 220344336 = 19905^2 + 14844^2 .

It is not a de Polignac number, because 616553361 - 2¹ = 616553359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (616553321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175740 + ... + 179213.

It is an arithmetic number, because the mean of its divisors is an integer number (74599499).

Almost surely, 2^616553361 is an apocalyptic number.

It is an amenable number.

616553361 is a deficient number, since it is larger than the sum of its proper divisors (278640627).

616553361 is a wasteful number, since it uses less digits than its factorization.

616553361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355152 (or 355149 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 616553361 is about 24830.4925645868. The cubic root of 616553361 is about 851.1188776411.

The spelling of 616553361 in words is "six hundred sixteen million, five hundred fifty-three thousand, three hundred sixty-one".