561332655 has 72 divisors (see below), whose sum is σ = 1088021376. Its totient is φ = 267321600.

The previous prime is 561332579. The next prime is 561332657. The reversal of 561332655 is 556233165.

561332655 is a `hidden beast` number, since 5 + 613 + 32 + 6 + 5 + 5 = 666.

561332655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 561332655 - 2²⁶ = 494223791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561332657) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 234565 + ... + 236945.

It is an arithmetic number, because the mean of its divisors is an integer number (15111408).

Almost surely, 2^561332655 is an apocalyptic number.

561332655 is a deficient number, since it is larger than the sum of its proper divisors (526688721).

561332655 is a wasteful number, since it uses less digits than its factorization.

561332655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449 (or 2433 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 561332655 is about 23692.4598765092. The cubic root of 561332655 is about 824.9103814498.

The spelling of 561332655 in words is "five hundred sixty-one million, three hundred thirty-two thousand, six hundred fifty-five".