561905735621 has 8 divisors (see below), whose sum is σ = 594799978080. Its totient is φ = 529912705392.

The previous prime is 561905735603. The next prime is 561905735623. The reversal of 561905735621 is 126537509165.

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 561905735621 - 2⁶ = 561905735557 is a prime.

It is a super-4 number, since 4×561905735621⁴ (a number of 48 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 561905735621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561905735623) by changing a digit.

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, 225301775 + ... + 225304268.

It is an arithmetic number, because the mean of its divisors is an integer number (74349997260).

Almost surely, 2^561905735621 is an apocalyptic number.

It is an amenable number.

561905735621 is a deficient number, since it is larger than the sum of its proper divisors (32894242459).

561905735621 is a wasteful number, since it uses less digits than its factorization.

561905735621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450606115.

The product of its (nonzero) digits is 1701000, while the sum is 50.

The spelling of 561905735621 in words is "five hundred sixty-one billion, nine hundred five million, seven hundred thirty-five thousand, six hundred twenty-one".