561591367236 has 405 divisors, whose sum is σ = 1632137805837. Its totient is φ = 168343868160.

The previous prime is 561591367231. The next prime is 561591367243. The reversal of 561591367236 is 632763195165.

The square root of 561591367236 is 749394.

It is a perfect power (a square), and thus also a powerful number.

561591367236 is a `hidden beast` number, since 5 + 615 + 9 + 13 + 6 + 7 + 2 + 3 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 437225112900 + 124366254336 = 661230^2 + 352656^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (6123600) is a multiple of the sum of its prime factors (270).

It is not an unprimeable number, because it can be changed into a prime (561591367231) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 7108751445 + ... + 7108751523.

Almost surely, 2^561591367236 is an apocalyptic number.

561591367236 is the 749394-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561591367236

561591367236 is an abundant number, since it is smaller than the sum of its proper divisors (1070546438601).

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

561591367236 is a wasteful number, since it uses less digits than its factorization.

561591367236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270 (or 132 counting only the distinct ones).

The product of its digits is 6123600, while the sum is 54.

The spelling of 561591367236 in words is "five hundred sixty-one billion, five hundred ninety-one million, three hundred sixty-seven thousand, two hundred thirty-six".