42165561 has 8 divisors (see below), whose sum is σ = 56263360. Its totient is φ = 28089072.

The previous prime is 42165553. The next prime is 42165569. The reversal of 42165561 is 16556124.

It is an interprime number because it is at equal distance from previous prime (42165553) and next prime (42165569).

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

It is not a de Polignac number, because 42165561 - 2³ = 42165553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42165569) 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, 75 + ... + 9183.

It is an arithmetic number, because the mean of its divisors is an integer number (7032920).

Almost surely, 2^42165561 is an apocalyptic number.

It is an amenable number.

42165561 is a deficient number, since it is larger than the sum of its proper divisors (14097799).

42165561 is a wasteful number, since it uses less digits than its factorization.

42165561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655.

The product of its digits is 7200, while the sum is 30.

The square root of 42165561 is about 6493.5014437513. The cubic root of 42165561 is about 348.0588072768.

The spelling of 42165561 in words is "forty-two million, one hundred sixty-five thousand, five hundred sixty-one".