42165656 has 16 divisors (see below), whose sum is σ = 85142400. Its totient is φ = 19461024.

The previous prime is 42165653. The next prime is 42165667. The reversal of 42165656 is 65656124.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42165653) 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 3 ways as a sum of consecutive naturals, for example, 202616 + ... + 202823.

It is an arithmetic number, because the mean of its divisors is an integer number (5321400).

Almost surely, 2^42165656 is an apocalyptic number.

It is an amenable number.

42165656 is an abundant number, since it is smaller than the sum of its proper divisors (42976744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42165656 is a wasteful number, since it uses less digits than its factorization.

42165656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405458 (or 405454 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 42165656 is about 6493.5087587529. The cubic root of 42165656 is about 348.0590686715.

The spelling of 42165656 in words is "forty-two million, one hundred sixty-five thousand, six hundred fifty-six".