561650404656 has 160 divisors (see below), whose sum is σ = 1627754745600. Its totient is φ = 165431664640.

The previous prime is 561650404633. The next prime is 561650404709. The reversal of 561650404656 is 656404056165.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2671240 + ... + 2873816.

It is an arithmetic number, because the mean of its divisors is an integer number (10173467160).

Almost surely, 2^561650404656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561650404656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (813877372800).

561650404656 is an abundant number, since it is smaller than the sum of its proper divisors (1066104340944).

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

561650404656 is a wasteful number, since it uses less digits than its factorization.

561650404656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202747 (or 202741 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 561650404656 in words is "five hundred sixty-one billion, six hundred fifty million, four hundred four thousand, six hundred fifty-six".