561026521660 has 48 divisors (see below), whose sum is σ = 1301529922560. Its totient is φ = 201427237440.

The previous prime is 561026521651. The next prime is 561026521703. The reversal of 561026521660 is 66125620165.

561026521660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 16122624 + ... + 16157383.

It is an arithmetic number, because the mean of its divisors is an integer number (27115206720).

Almost surely, 2^561026521660 is an apocalyptic number.

It is an amenable number.

561026521660 is an abundant number, since it is smaller than the sum of its proper divisors (740503400900).

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

561026521660 is a wasteful number, since it uses less digits than its factorization.

561026521660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32280106 (or 32280104 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 561026521660 in words is "five hundred sixty-one billion, twenty-six million, five hundred twenty-one thousand, six hundred sixty".