42165653 has 2 divisors, whose sum is σ = 42165654. Its totient is φ = 42165652.

The previous prime is 42165649. The next prime is 42165667. The reversal of 42165653 is 35656124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37662769 + 4502884 = 6137^2 + 2122^2 .

It is a cyclic number.

It is not a de Polignac number, because 42165653 - 2² = 42165649 is a prime.

It is a super-3 number, since 3×42165653³ (a number of 24 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42165553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21082826 + 21082827.

It is an arithmetic number, because the mean of its divisors is an integer number (21082827).

Almost surely, 2^42165653 is an apocalyptic number.

It is an amenable number.

42165653 is a deficient number, since it is larger than the sum of its proper divisors (1).

42165653 is an equidigital number, since it uses as much as digits as its factorization.

42165653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

The square root of 42165653 is about 6493.5085277529. The cubic root of 42165653 is about 348.0590604169.

The spelling of 42165653 in words is "forty-two million, one hundred sixty-five thousand, six hundred fifty-three".