561253421634 has 16 divisors (see below), whose sum is σ = 1122825146688. Its totient is φ = 187031423312.

The previous prime is 561253421629. The next prime is 561253421717. The reversal of 561253421634 is 436124352165.

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 7 ways as a sum of consecutive naturals, for example, 13239717 + ... + 13282040.

It is an arithmetic number, because the mean of its divisors is an integer number (70176571668).

Almost surely, 2^561253421634 is an apocalyptic number.

561253421634 is an abundant number, since it is smaller than the sum of its proper divisors (561571725054).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561253421634 is a wasteful number, since it uses less digits than its factorization.

561253421634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26525289.

The product of its digits is 518400, while the sum is 42.

Adding to 561253421634 its reverse (436124352165), we get a palindrome (997377773799).

The spelling of 561253421634 in words is "five hundred sixty-one billion, two hundred fifty-three million, four hundred twenty-one thousand, six hundred thirty-four".