42635661 has 8 divisors (see below), whose sum is σ = 58169760. Its totient is φ = 27762672.

The previous prime is 42635657. The next prime is 42635683. The reversal of 42635661 is 16653624.

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

It is not a de Polignac number, because 42635661 - 2² = 42635657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42635611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165126 + ... + 165383.

It is an arithmetic number, because the mean of its divisors is an integer number (7271220).

Almost surely, 2^42635661 is an apocalyptic number.

It is an amenable number.

42635661 is a deficient number, since it is larger than the sum of its proper divisors (15534099).

42635661 is a wasteful number, since it uses less digits than its factorization.

42635661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330555.

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

The square root of 42635661 is about 6529.5988391325. The cubic root of 42635661 is about 349.3475218057.

The spelling of 42635661 in words is "forty-two million, six hundred thirty-five thousand, six hundred sixty-one".