42665861 has 8 divisors (see below), whose sum is σ = 48802560. Its totient is φ = 36539568.

The previous prime is 42665807. The next prime is 42665867. The reversal of 42665861 is 16856624.

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 42665861 - 2¹⁰ = 42664837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42665867) 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, 10820 + ... + 14226.

It is an arithmetic number, because the mean of its divisors is an integer number (6100320).

Almost surely, 2^42665861 is an apocalyptic number.

It is an amenable number.

42665861 is a deficient number, since it is larger than the sum of its proper divisors (6136699).

42665861 is a wasteful number, since it uses less digits than its factorization.

42665861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5203.

The product of its digits is 69120, while the sum is 38.

The square root of 42665861 is about 6531.9109761233. The cubic root of 42665861 is about 349.4299864599.

The spelling of 42665861 in words is "forty-two million, six hundred sixty-five thousand, eight hundred sixty-one".