6561443514750 has 128 divisors (see below), whose sum is σ = 16439083315200. Its totient is φ = 1743133392000.

The previous prime is 6561443514739. The next prime is 6561443514781. The reversal of 6561443514750 is 574153441656.

It is a junction number, because it is equal to n+sod(n) for n = 6561443514693 and 6561443514702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 306498547 + ... + 306519953.

It is an arithmetic number, because the mean of its divisors is an integer number (128430338400).

Almost surely, 2^{6561443514750} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6561443514750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8219541657600).

6561443514750 is an abundant number, since it is smaller than the sum of its proper divisors (9877639800450).

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

6561443514750 is a wasteful number, since it uses less digits than its factorization.

6561443514750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22947 (or 22937 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 51.

The spelling of 6561443514750 in words is "six trillion, five hundred sixty-one billion, four hundred forty-three million, five hundred fourteen thousand, seven hundred fifty".