561551922540 has 288 divisors, whose sum is σ = 2033942916096. Its totient is φ = 122617566720.

The previous prime is 561551922521. The next prime is 561551922553. The reversal of 561551922540 is 45229155165.

561551922540 is a `hidden beast` number, since 5 + 6 + 1 + 551 + 92 + 2 + 5 + 4 + 0 = 666.

561551922540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 23490834 + ... + 23514726.

It is an arithmetic number, because the mean of its divisors is an integer number (7062301792).

Almost surely, 2^561551922540 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 561551922540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016971458048).

561551922540 is an abundant number, since it is smaller than the sum of its proper divisors (1472390993556).

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

561551922540 is a wasteful number, since it uses less digits than its factorization.

561551922540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24749 (or 24744 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 561551922540 in words is "five hundred sixty-one billion, five hundred fifty-one million, nine hundred twenty-two thousand, five hundred forty".