561565233666 has 32 divisors (see below), whose sum is σ = 1248169150080. Its totient is φ = 187151449968.

The previous prime is 561565233637. The next prime is 561565233737. The reversal of 561565233666 is 666332565165.

It is a super-3 number, since 3×561565233666³ (a number of 36 digits) contains 333 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750006 + ... + 1298321.

It is an arithmetic number, because the mean of its divisors is an integer number (39005285940).

Almost surely, 2^561565233666 is an apocalyptic number.

561565233666 is an abundant number, since it is smaller than the sum of its proper divisors (686603916414).

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

561565233666 is a wasteful number, since it uses less digits than its factorization.

561565233666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053415 (or 2053409 counting only the distinct ones).

The product of its digits is 17496000, while the sum is 54.

The spelling of 561565233666 in words is "five hundred sixty-one billion, five hundred sixty-five million, two hundred thirty-three thousand, six hundred sixty-six".