616561255 has 8 divisors (see below), whose sum is σ = 744840000. Its totient is φ = 489938016.

The previous prime is 616561249. The next prime is 616561259. The reversal of 616561255 is 552165616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-616561255 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616561259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413055 + ... + 414544.

It is an arithmetic number, because the mean of its divisors is an integer number (93105000).

Almost surely, 2^616561255 is an apocalyptic number.

616561255 is a deficient number, since it is larger than the sum of its proper divisors (128278745).

616561255 is a wasteful number, since it uses less digits than its factorization.

616561255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827753.

The product of its digits is 54000, while the sum is 37.

The square root of 616561255 is about 24830.6515218590. The cubic root of 616561255 is about 851.1225100402.

The spelling of 616561255 in words is "six hundred sixteen million, five hundred sixty-one thousand, two hundred fifty-five".