561664234121125 has 16 divisors (see below), whose sum is σ = 700957736644464. Its totient is φ = 449330892129600.

The previous prime is 561664234121099. The next prime is 561664234121149. The reversal of 561664234121125 is 521121432466165.

It can be written as a sum of positive squares in 8 ways, for example, as 456822997002724 + 104841237118401 = 21373418^2 + 10239201^2 .

It is not a de Polignac number, because 561664234121125 - 2⁵ = 561664234121093 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 15 ways as a sum of consecutive naturals, for example, 147697087 + ... + 151452163.

It is an arithmetic number, because the mean of its divisors is an integer number (43809858540279).

Almost surely, 2^{561664234121125} is an apocalyptic number.

It is an amenable number.

561664234121125 is a deficient number, since it is larger than the sum of its proper divisors (139293502523339).

561664234121125 is a wasteful number, since it uses less digits than its factorization.

561664234121125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951689 (or 4951679 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 49.

The spelling of 561664234121125 in words is "five hundred sixty-one trillion, six hundred sixty-four billion, two hundred thirty-four million, one hundred twenty-one thousand, one hundred twenty-five".