561373655 has 16 divisors (see below), whose sum is σ = 685753344. Its totient is φ = 441100800.

The previous prime is 561373633. The next prime is 561373669. The reversal of 561373655 is 556373165.

It is not a de Polignac number, because 561373655 - 2¹⁰ = 561372631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59759 + ... + 68511.

It is an arithmetic number, because the mean of its divisors is an integer number (42859584).

Almost surely, 2^561373655 is an apocalyptic number.

561373655 is a deficient number, since it is larger than the sum of its proper divisors (124379689).

561373655 is a wasteful number, since it uses less digits than its factorization.

561373655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8986.

The product of its digits is 283500, while the sum is 41.

The square root of 561373655 is about 23693.3251148926. The cubic root of 561373655 is about 824.9304649077.

The spelling of 561373655 in words is "five hundred sixty-one million, three hundred seventy-three thousand, six hundred fifty-five".