561640060540 has 96 divisors (see below), whose sum is σ = 1367681837760. Its totient is φ = 191868112896.

The previous prime is 561640060529. The next prime is 561640060543. The reversal of 561640060540 is 45060046165.

It is a self number, because there is not a number n which added to its sum of digits gives 561640060540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561640060543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 816067 + ... + 1337626.

It is an arithmetic number, because the mean of its divisors is an integer number (14246685810).

Almost surely, 2^561640060540 is an apocalyptic number.

It is an amenable number.

561640060540 is an abundant number, since it is smaller than the sum of its proper divisors (806041777220).

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

561640060540 is a wasteful number, since it uses less digits than its factorization.

561640060540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153791 (or 2153789 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 561640060540 in words is "five hundred sixty-one billion, six hundred forty million, sixty thousand, five hundred forty".