561616555 has 8 divisors (see below), whose sum is σ = 674492112. Its totient is φ = 448925088.

The previous prime is 561616541. The next prime is 561616577. The reversal of 561616555 is 555616165.

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 561616555 - 2⁷ = 561616427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39217 + ... + 51586.

It is an arithmetic number, because the mean of its divisors is an integer number (84311514).

Almost surely, 2^561616555 is an apocalyptic number.

561616555 is a deficient number, since it is larger than the sum of its proper divisors (112875557).

561616555 is a wasteful number, since it uses less digits than its factorization.

561616555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92045.

The product of its digits is 135000, while the sum is 40.

The square root of 561616555 is about 23698.4504767717. The cubic root of 561616555 is about 825.0494270968.

The spelling of 561616555 in words is "five hundred sixty-one million, six hundred sixteen thousand, five hundred fifty-five".