561816803520 has 280 divisors, whose sum is σ = 2283979261344. Its totient is φ = 128415227904.

The previous prime is 561816803501. The next prime is 561816803549. The reversal of 561816803520 is 25308618165.

561816803520 is a `hidden beast` number, since 5 + 61 + 8 + 1 + 68 + 0 + 3 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (280).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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 39 ways as a sum of consecutive naturals, for example, 1366777 + ... + 1729656.

Almost surely, 2^561816803520 is an apocalyptic number.

It is an amenable number.

561816803520 is an abundant number, since it is smaller than the sum of its proper divisors (1722162457824).

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

561816803520 is a wasteful number, since it uses less digits than its factorization.

561816803520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096469 (or 3096450 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 561816803520 in words is "five hundred sixty-one billion, eight hundred sixteen million, eight hundred three thousand, five hundred twenty".