561628543729 has 4 divisors (see below), whose sum is σ = 612685684080. Its totient is φ = 510571403380.

The previous prime is 561628543717. The next prime is 561628543759. The reversal of 561628543729 is 927345826165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561628543729 is a prime.

It is a super-2 number, since 2×561628543729² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561628543759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25528570159 + ... + 25528570180.

It is an arithmetic number, because the mean of its divisors is an integer number (153171421020).

Almost surely, 2^561628543729 is an apocalyptic number.

It is an amenable number.

561628543729 is a deficient number, since it is larger than the sum of its proper divisors (51057140351).

561628543729 is a wasteful number, since it uses less digits than its factorization.

561628543729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51057140350.

The product of its digits is 21772800, while the sum is 58.

The spelling of 561628543729 in words is "five hundred sixty-one billion, six hundred twenty-eight million, five hundred forty-three thousand, seven hundred twenty-nine".