561235566 has 16 divisors (see below), whose sum is σ = 1181548800. Its totient is φ = 177232248.

The previous prime is 561235537. The next prime is 561235583. The reversal of 561235566 is 665532165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2461446 + ... + 2461673.

It is an arithmetic number, because the mean of its divisors is an integer number (73846800).

Almost surely, 2^561235566 is an apocalyptic number.

561235566 is an abundant number, since it is smaller than the sum of its proper divisors (620313234).

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

561235566 is a wasteful number, since it uses less digits than its factorization.

561235566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4923143.

The product of its digits is 162000, while the sum is 39.

The square root of 561235566 is about 23690.4108448967. The cubic root of 561235566 is about 824.8628194315.

The spelling of 561235566 in words is "five hundred sixty-one million, two hundred thirty-five thousand, five hundred sixty-six".