561233645 has 8 divisors (see below), whose sum is σ = 769691904. Its totient is φ = 384845904.

The previous prime is 561233623. The next prime is 561233657. The reversal of 561233645 is 546332165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561233645 - 2⁸ = 561233389 is a prime.

It is a super-3 number, since 3×561233645³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 16035247 = 561233645 / (5 + 6 + 1 + 2 + 3 + 3 + 6 + 4 + 5).

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 8017589 + ... + 8017658.

It is an arithmetic number, because the mean of its divisors is an integer number (96211488).

Almost surely, 2^561233645 is an apocalyptic number.

It is an amenable number.

561233645 is a deficient number, since it is larger than the sum of its proper divisors (208458259).

561233645 is a wasteful number, since it uses less digits than its factorization.

561233645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16035259.

The product of its digits is 64800, while the sum is 35.

The square root of 561233645 is about 23690.3703010316. The cubic root of 561233645 is about 824.8618783156.

The spelling of 561233645 in words is "five hundred sixty-one million, two hundred thirty-three thousand, six hundred forty-five".