42066639 has 6 divisors (see below), whose sum is σ = 60762936. Its totient is φ = 28044420.

The previous prime is 42066593. The next prime is 42066643. The reversal of 42066639 is 93666024.

42066639 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 42066639 - 2¹³ = 42058447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42066679) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2337027 + ... + 2337044.

It is an arithmetic number, because the mean of its divisors is an integer number (10127156).

Almost surely, 2^42066639 is an apocalyptic number.

42066639 is a deficient number, since it is larger than the sum of its proper divisors (18696297).

42066639 is a wasteful number, since it uses less digits than its factorization.

42066639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4674077 (or 4674074 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 42066639 is about 6485.8799711373. The cubic root of 42066639 is about 347.7864077728.

The spelling of 42066639 in words is "forty-two million, sixty-six thousand, six hundred thirty-nine".