561836213460 has 72 divisors (see below), whose sum is σ = 1706025321000. Its totient is φ = 149665732608.

The previous prime is 561836213447. The next prime is 561836213461. The reversal of 561836213460 is 64312638165.

561836213460 is a `hidden beast` number, since 5 + 6 + 18 + 3 + 621 + 3 + 4 + 6 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 188187645636 + 373648567824 = 433806^2 + 611268^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561836213461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1466085 + ... + 1809164.

It is an arithmetic number, because the mean of its divisors is an integer number (23694796125).

Almost surely, 2^561836213460 is an apocalyptic number.

It is an amenable number.

561836213460 is an abundant number, since it is smaller than the sum of its proper divisors (1144189107540).

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

561836213460 is a wasteful number, since it uses less digits than its factorization.

561836213460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276217 (or 3276212 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 561836213460 in words is "five hundred sixty-one billion, eight hundred thirty-six million, two hundred thirteen thousand, four hundred sixty".