42663561 has 8 divisors (see below), whose sum is σ = 56968704. Its totient is φ = 28400400.

The previous prime is 42663539. The next prime is 42663563. The reversal of 42663561 is 16536624.

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

It is not a de Polignac number, because 42663561 - 2⁵ = 42663529 is a prime.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (42663563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8041 + ... + 12246.

It is an arithmetic number, because the mean of its divisors is an integer number (7121088).

Almost surely, 2^42663561 is an apocalyptic number.

It is an amenable number.

42663561 is a deficient number, since it is larger than the sum of its proper divisors (14305143).

42663561 is a wasteful number, since it uses less digits than its factorization.

42663561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20991.

The product of its digits is 25920, while the sum is 33.

The square root of 42663561 is about 6531.7349150130. The cubic root of 42663561 is about 349.4237074084.

The spelling of 42663561 in words is "forty-two million, six hundred sixty-three thousand, five hundred sixty-one".