561165455 has 8 divisors (see below), whose sum is σ = 675097152. Its totient is φ = 447799968.

The previous prime is 561165419. The next prime is 561165487. The reversal of 561165455 is 554561165.

It is a happy number.

561165455 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 561165455 - 2¹⁶ = 561099919 is a prime.

It is a Duffinian number.

It is a congruent 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, 139367 + ... + 143336.

It is an arithmetic number, because the mean of its divisors is an integer number (84387144).

Almost surely, 2^561165455 is an apocalyptic number.

561165455 is a deficient number, since it is larger than the sum of its proper divisors (113931697).

561165455 is a wasteful number, since it uses less digits than its factorization.

561165455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283105.

The product of its digits is 90000, while the sum is 38.

The square root of 561165455 is about 23688.9310649510. The cubic root of 561165455 is about 824.8284700015.

The spelling of 561165455 in words is "five hundred sixty-one million, one hundred sixty-five thousand, four hundred fifty-five".