66442542 has 16 divisors (see below), whose sum is σ = 135064272. Its totient is φ = 21784320.

The previous prime is 66442507. The next prime is 66442559. The reversal of 66442542 is 24524466.

It is a super-2 number, since 2×66442542² = 8829222774843528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90403 + ... + 91134.

It is an arithmetic number, because the mean of its divisors is an integer number (8441517).

Almost surely, 2^66442542 is an apocalyptic number.

66442542 is an abundant number, since it is smaller than the sum of its proper divisors (68621730).

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

66442542 is a wasteful number, since it uses less digits than its factorization.

66442542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181603.

The product of its digits is 46080, while the sum is 33.

The square root of 66442542 is about 8151.2294778150. The cubic root of 66442542 is about 405.0252323862.

The spelling of 66442542 in words is "sixty-six million, four hundred forty-two thousand, five hundred forty-two".