42665655 has 16 divisors (see below), whose sum is σ = 68433120. Its totient is φ = 22699008.

The previous prime is 42665627. The next prime is 42665663. The reversal of 42665655 is 55656624.

It is a happy number.

42665655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42665655 - 2⁷ = 42665527 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3211 + ... + 9779.

It is an arithmetic number, because the mean of its divisors is an integer number (4277070).

Almost surely, 2^42665655 is an apocalyptic number.

42665655 is a deficient number, since it is larger than the sum of its proper divisors (25767465).

42665655 is a wasteful number, since it uses less digits than its factorization.

42665655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010.

The product of its digits is 216000, while the sum is 39.

The square root of 42665655 is about 6531.8952073652. The cubic root of 42665655 is about 349.4294240845.

The spelling of 42665655 in words is "forty-two million, six hundred sixty-five thousand, six hundred fifty-five".