42660561 has 8 divisors (see below), whose sum is σ = 59353920. Its totient is φ = 27203792.

The previous prime is 42660559. The next prime is 42660571. The reversal of 42660561 is 16506624.

42660561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42660561 - 2¹ = 42660559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42660521) 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 7 ways as a sum of consecutive naturals, for example, 309066 + ... + 309203.

It is an arithmetic number, because the mean of its divisors is an integer number (7419240).

Almost surely, 2^42660561 is an apocalyptic number.

It is an amenable number.

42660561 is a deficient number, since it is larger than the sum of its proper divisors (16693359).

42660561 is a wasteful number, since it uses less digits than its factorization.

42660561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618295.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 42660561 is about 6531.5052629543. The cubic root of 42660561 is about 349.4155170021.

The spelling of 42660561 in words is "forty-two million, six hundred sixty thousand, five hundred sixty-one".